Travel Packing & Handy Gear Guide 2026 — Packing Lists, Suitcases, Charging and Transit Comfort
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Trips go wrong from packing too much, not from forgetting things
When people think about what to pack, they tend to focus on “what not to forget.” But what really matters once you arrive is how lightly you can move. An overstuffed suitcase drags on you the whole way: on station stairs, in tiny hotel elevators, on cobblestone streets. Forgotten items can often be bought on the spot, but weight and capacity are fixed the moment you leave and can’t be changed until the trip is over. That is why preparation is as much about optimizing as it is about making a list.
This guide builds your packing by subtraction, not addition. It first sorts the things you truly can’t forget by importance, then works through the trouble spots in the order people tend to stumble: the rules for carry-on, checked baggage, liquids and power banks that cause the most incidents, choosing a suitcase by working back from the number of days, keeping your devices charged and connected, comfort gear for each mode of transport, and the differences between domestic and overseas trips. Booking hotels and transport is covered separately in the Travel and Accommodation Booking Guide. For how to choose individual items, the relevant sections link to dedicated articles.
When you can’t decide what to pack, ask: “Can I buy it there, or will the hotel have it?” Toothbrushes, slippers and toiletries can often be replaced by hotel amenities, whereas chargers, regular medication and ID cannot be replaced, so they come first. The more replaceable items you cut, the lighter your trip becomes.
Sort what you can’t afford to forget by importance
Rather than just listing items, rank them by how much it would hurt to lose or forget them, and your final check on departure day gets much easier. Get into the habit of checking from the top of the three levels below and working down.
| Importance | Examples | Why it goes here |
|---|---|---|
| Irreplaceable | ID, passport, tickets, regular medication, cash and cards | Forgetting them stops the trip itself. Keep them in your carry-on, and keep copies in a place separate from your wallet |
| Annoying to replace | Phone charger, cables, power bank, glasses or contact lenses | Buying locally costs more and the specs may not match. Charging gear is a lifeline tied directly to maps, bookings and your camera |
| Manageable on site | Toothbrush, slippers, everyday toiletries, folding umbrella, eco bag | Convenience stores and hotels can fill in. When in doubt, cut from this level first to travel lighter |
For the top level, the “irreplaceable items,” the trick is to gather them in one place a few days ahead, not the night before departure. If you start searching on the morning of your trip, panic makes you miss things. Bring regular medication for your normal needs plus a little extra beyond the length of the trip. Abroad, a note about your prescription or English information can help at security checks or if you need to see a doctor.
The rule for valuables is “don’t keep them all in one place.” If cash, cards and ID are all in one wallet, losing it or having it stolen ruins everything. Spread them across your carry-on, a secondary bag and the hotel safe, and keep photo copies of your passport and tickets on your phone for peace of mind.
In-flight rules so you don’t get stopped at security
Even perfect preparation is undone if you get stopped at security, which costs you time and energy right at the start. Liquids and power banks in particular can force you to take items out on the spot, check them in, or in the worst case give them up if you pack without knowing the rules. If your trip involves a flight, check this part in advance.
Strict carry-on rules apply to liquids
For liquids such as lotion, sunscreen, toothpaste and gels, carry-on baggage has a volume limit per container, and the basic rule is to put them together in a clear bag (strict on international flights, with different practices on domestic flights). Large bottles taken as they are tend to get stopped at screening, so the standard approach is to decant into small containers, or send bulkier items in your checked baggage. Decant only the skincare and basic cosmetics you need for the trip into travel sizes, and you gain room in both volume and luggage.
Power banks “can’t be checked”
Power banks contain lithium-ion batteries, so for fire-risk reasons the rule is that they can’t go in checked baggage and must be carried on board. There are also limits on whether you can bring them and how many, depending on capacity (Wh rating), so you need to follow your airline’s rules. Choosing a product with a clearly printed capacity makes screening smoother. For how to choose one, see How to Choose a Power Bank.
| Item | Carry-on | Checked | Notes |
|---|---|---|---|
| Power bank | Carry-on is the rule | Not allowed | Choose one with a visible capacity rating. Check limits on number and capacity with your airline |
| Large liquids (lotion, etc.) | Volume limits apply | Safer to check | Carry on in small containers in a clear bag. Especially strict on international flights |
| Scissors, blades | Often not allowed | Check them | Easy to leave in carry-on by mistake. Check items like nail clippers too |
| Regular and prescription medication | Carry-on | Splitting them up is safer | Abroad, a note about the prescription or English information gives peace of mind |
Rules change by airline, route and season, so what is listed here is only a rough guide to the points people often get unsure about. For a final answer on what is allowed, always check the official guidance of the airline you are using. Deciding item by item at packing time whether each thing goes in carry-on or checked baggage keeps you from scrambling at the airport.
Luggage mistakes tend to happen in the same places
There are surprisingly few kinds of luggage trouble on trips. And more often than “simply forgetting,” the cause is a wrong call made at the preparation stage. Here are the mistakes that actually tend to happen with travel packing, organized by cause.
Putting a power bank in the suitcase
The most common is putting a lithium-ion battery in checked baggage. Power banks are, as a rule, carry-on only and can’t be checked. On the day of departure, the counter asks, “Is there a battery in there?” and you end up reopening the suitcase you just closed.
The fix is simple: at the very start of packing, gather everything that holds a charge on the carry-on side. Power banks, charging cables, e-cigarettes, wireless earbud cases, heated hair irons: if you keep everything that “charges” in one place, you won’t have to scramble to find it later. A battery whose capacity marking is wearing off may be stopped because you can’t show it is within the limit, so it is safer to bring one whose marking is legible.
Thinking “it’s a small liquid, so it’s fine” and losing everything
The liquid limit on international flights works on two conditions: a capacity limit per container, and putting everything together in a clear bag. People get caught in two ways: the container was small but wasn’t in a bag, and things they didn’t think of as liquids. Sunscreen, lip balm, toothpaste, gel hair products and hand cream may feel solid, but they are treated as liquids or gels. If you stuff the whole makeup pouch into your bag, you’ll have to take everything out at the checkpoint.
The most effective measure is to separate bathroom items into “for use on the plane” and “for use at the destination” from the start. Limit what you use on board to things like eye drops and lip balm, and put only those in the clear bag. Everything else goes in the suitcase. With this split, the bag holds less, and screening finishes faster.
Wheels and zippers break mid-trip
The most common suitcase failures are worn wheels and torn zippers. Especially after dragging a suitcase a long way over cobblestones or rough pavement, small-diameter wheels visibly wear down. Also, a zippered suitcase packed to the limit can tear from the fabric along the seam when lifted while still under tension.
To avoid this, choose a suitcase with the road surfaces at your destination in mind, and decide on capacity assuming your luggage will grow on the way back. For a trip through old towns or on gravel, large-diameter wheels or a backpack are better; if you mostly shuttle between airport and hotel, small wheels are fine. If you know souvenirs will bulk it up, choose one with an expansion feature or one size larger from the start.
Confusing a plug adapter with a voltage converter
The classic way to ruin an appliance abroad is matching only the plug shape without checking the voltage. A plug adapter only matches the shape of the socket; it does not change the voltage. Plug a hair iron or dryer made only for Japan’s 100V into a region with over 200V, and it stops working instantly.
Before you buy, check the label on the device itself or its power adapter. If it says “100-240V,” it can be used as is in many parts of the world. If it says only “100V,” you need a voltage converter, but heat-producing appliances with high power consumption are hard to run even with a converter, so buying locally or using what the hotel provides is often the more realistic choice.
Chargers for phones, laptops and cameras work almost worldwide, but hair dryers, hair irons and electric kettles are categories that often don’t. Before you take one, always read the markings on the device itself.
Your checked bag doesn’t arrive and you have nothing on hand
Delayed luggage is a trouble that tends to happen on connecting flights. What counts then is what you kept in your carry-on. Regular medication, spare contact lenses, a full set of underwear, chargers and valuables should basically go in your carry-on. Prescription drugs in particular are hard to get in the same form locally, so never check them.
As soon as you realize your bag isn’t coming out, file a claim at the airport counter before you leave the spot. Once you move away, filing a tracing report becomes a hassle.
Choose a suitcase by working back from the number of days
The most common regret when choosing a suitcase is buying one that’s too big and never using all of it. The right capacity isn’t “better safe than sorry,” it is “just right for the number of days.” A big bag makes you pack more, trapping you in a cycle of heavy loads and fatigue. Start with the number of days and get a rough feel for capacity.
| Trip length | Capacity guide | Carry-on or checked? |
|---|---|---|
| 1–2 nights | Up to about 40L | Travel light with a carry-on size. No waiting at baggage claim is a real advantage |
| 3–5 nights | About 40–60L | Right up to the carry-on limit, to mid-size. Leave a little room for souvenirs |
| About 1 week | About 60–80L | Assume checked. Check before departure that it fits within the weight limit |
| Long stay, overseas | 80L or more | Large. Watch out for exceeding checked-bag weight. Assume you’ll add a secondary bag |
Once capacity is settled, next comes usability. As also mentioned in the detailed suitcase guide, the things easy to overlook are how the wheels move and how it opens. Four-wheel casters glide on flat floors, but on rough ground two wheels can be easier to handle. For opening, the sturdy frame type and the zipper type, which wins on lightness and expandability, have different personalities. If you are aiming for carry-on, note that the sum-of-three-sides and with-wheels size rules differ by airline.
How you pack lets the “same capacity” hold more
Even in the same suitcase, how you pack changes the capacity you feel. Reduce bulk in clothing with compression bags or sorting pouches, and move heavy items (shoes, books, cosmetic bottles, etc.) to the wheel side, which is the bottom, for stability when rolling. Fill gaps with socks and underwear as cushioning. Leave 10–20% of the space empty from the start for souvenirs you’ll pick up, and you’ll avoid a bag that is too full to close on the way home.
Never let power or connectivity run out: your lifeline on the road
Today’s trips put maps, booking confirmations, transit info, the camera and payments almost entirely on one smartphone. That means the moment your phone dies, your trip stops functioning. Among the things you can forget, the most damaging are the ones for charging and connectivity. Prepare in several layers.
- Power bank: the main safeguard against a dead battery while out. On a day of sightseeing on foot, a phone battery often starts to feel shaky after midday. Choose one with generous capacity and output. As noted above, watch the carry-on rules on planes
- Chargers and cables: with one multi-port charger you can charge your phone, power bank and earbuds together from a single hotel outlet. On a family trip, you can cycle through several devices overnight, and fighting over outlets is less likely
- Phone accessories: spare cables, a strap, a stand so you can view the map hands-free while sightseeing, a waterproof case for rain or the beach, and other small items that help on the road
- Overseas, secure a plug adapter and connectivity: without a plug adapter that fits the outlets at your destination, your charger itself is useless. Also arrange ways to get online before you leave, such as a local SIM, eSIM or a rental Wi-Fi device
With charging gear, the classic pitfall is “forgetting just the cable.” Keep your charger, cable and power bank together as a set in one small pouch, and you’re less likely to forget them and they won’t get scattered at the hotel. Overseas, put the plug adapter in the same pouch. That alone prevents most “I can’t charge here” accidents.
Choosing “comfort gear” by mode of transport
Travel fatigue comes from different places depending on the vehicle. So instead of “just get a neck pillow,” choose gear that targets the hardest part of that particular journey, and it works far better. Let’s compare three typical ways of getting around.
| Transport | Common pain points | Gear that helps |
|---|---|---|
| Plane (long-haul) | Dryness, air pressure, neck support, swollen legs | Neck pillow, eye mask, earplugs, compression socks, moisturizing mask |
| Shinkansen / limited express | Long hours sitting, strain on the lower back | Lumbar cushion, light neck pillow, power bank |
| Overnight bus | Cramped space, light and noise around you, dryness | Eye mask, earplugs, neck and back support, a jacket you can drape over yourself |
On long flights, neck support and blocking light and noise work best. The neck pillow, eye mask and earplugs among the travel goods make a big difference in whether you can sleep on board. On the Shinkansen and limited express trains, you sit for a long time and the strain on your lower back bothers you more than your neck, so a lumbar cushion can make a more noticeable difference. On overnight buses, cramped space and the light and noise around you are the biggest enemies, and besides light- and sound-blocking gear, a layer you can drape over yourself against the cold inside quietly helps a lot.
Comfort at your lodging can also be lifted with a few portable items. Portable toiletries, foldable slippers and a folding eco bag for shopping are classics that take little space yet often make you feel “glad I brought it.”
For solo trips, family trips and business trips, the right luggage differs
Even for the same “four days, three nights,” the best luggage depends entirely on who you’re with and how you move. Here we go through the patterns where choices tend to diverge, with the direction to take and the choices to avoid.
Traveling alone: plan on the assumption that you can’t put your bag down and walk away
What is decisive on a solo trip is that there is never a moment when you can take your eyes off your luggage. You take it with you to the toilet, to meals and to the currency exchange. So what matters more than capacity is handling: can you climb stairs without letting go, does it fit at your feet under a chair, can you open and close it with one hand?
A carry-on-size suitcase or a backpack you can wear suits this well. What to avoid is carrying two pieces: a large suitcase plus a big tote. One hand is completely tied up, and you can’t even take out your ticket. Make the secondary bag a shoulder bag or body bag that stays fixed on your body and keep both hands free, and getting around feels completely different.
For power, choosing a single power bank with extra capacity ends up lighter than carrying two small ones. Two small ones tend to mean two cables as well.
Family or group trips: don’t divide luggage by person
A common approach on family trips is to pack everyone’s things into one large suitcase. It looks efficient by total weight, but you have to dig through everyone’s belongings every time you arrive at a hotel, and it is a mess every night. And if you consolidate into one, losing that one bag means losing everything.
What we recommend is dividing luggage by “purpose,” not by “person.” Put clothes in one case, color-coded by person with compression bags or packing cubes; toiletries and medicine in one shared pouch for the family; jackets and rain gear in an easy-to-reach outer pocket. This greatly reduces the time spent searching for things.
If you are traveling with children, prioritize a suitcase that stands up on its own and is stable. When you pull it with one hand while holding a child, even a four-wheel suitcase tips over if the center of gravity is high. A lower, wider one is easier to handle. If your child carries a backpack, keep it to a drink, snacks and one change of clothes so they don’t get fed up.
Business and work trips: create something “the same every time”
With frequent business trips, thinking it over each time is the biggest waste. It is efficient to fix the contents of each pouch and not repack them for every trip. Keep a gadget pouch with charger, cables and adapter, and a toiletry pouch with razor and toothbrush set up permanently, and when you change bags, move the pouches as they are.
It is realistic to build around a carry-on-size suitcase only. Checking a bag means waiting at baggage claim and adds risk on connections. If you carry jackets and shirts, a front-opening type that lies flat or one with a clothes compartment inside is suitable.
What to avoid is thinking that because you have little luggage, one business bag will do, and putting all the weight on one shoulder. With a laptop, documents and a change of clothes, even a one-way trip will hurt your shoulder. Even if it is small, make it a shape that can sit on a wheeled case, and the way your energy drains changes.
People who rarely travel: borrow or improvise instead of buying everything
If you travel only once every few years, buying a full set of dedicated gear isn’t efficient. A suitcase takes up a lot of storage space, and if you don’t use it for long, the urethane handle and seals deteriorate. If you travel less than once a year, renting is worth considering.
If you do buy, the priority order is suitcase first, then power bank, then neck pillow and compression bags. The higher ones have no substitute, while the lower ones can be managed with what you have at home. A zip bag instead of a compression bag, or a rolled-up jacket instead of a neck pillow, is enough for short trips.
If you have limited storage space
A suitcase doesn’t get smaller when folded. If space is tight, you can choose sizes that nest inside each other, or choose a soft case or backpack in the first place. You can also store off-season clothes in a hard case and use it as a piece of storage furniture, but moisture builds up, so adding desiccant gives peace of mind.
If you often travel with several people, buying carry-on-size cases for each person is more flexible than buying one large one. They work for solo trips and business trips, and for a trip for two, putting two side by side gives plenty of capacity.
What changes in your luggage between domestic and overseas trips
The basis of your packing is the same at home and abroad, but overseas adds several preparations you don’t need in your home country. Domestic trips, in contrast, can be light and mostly come down to the season and the weather at your destination. Let’s sort out the differences.
| Item | Domestic trip | Overseas trip |
|---|---|---|
| ID and documents | ID, tickets | Passport, visa, various confirmations (keep copies in separate places too) |
| Power | Works as is | Plug adapter required. Check voltage compatibility too |
| Connectivity | Your usual plan is fine | Arrange a local SIM, eSIM or rental Wi-Fi |
| Money | Cash, cards | Local currency, a card usable overseas, and a small reserve of cash |
| Regular medication | Your usual amount | Extra, and English information gives peace of mind |
On either kind of trip, what counts in the end is adjusting to the season and the climate of your destination. Take a layer you can put on and take off in regions with big temperature swings, a hat, sunglasses and sunscreen where the sun is strong, and a folding umbrella or rain gear where there is a rainy season. Clothing that doesn’t suit the climate eats into your time there by itself. The earlier you arrange lodging and transport, the wider your options, so it also helps to get ahead on the booking guide alongside your packing.
Buying travel gear wisely
If you buy suitcases, power banks and travel goods in a rush just before your trip, you tend to get fewer options and a worse deal. Arrange the standard items you know you’ll use early, once your itinerary is settled, and both selection and cost tend to work in your favor.
- Avoid the days right before big holidays: just before periods when travel demand peaks, such as Golden Week or the year-end and New Year holidays, suitcases and travel goods also tend to be scarce and expensive. Get a handle on the year’s price changes with the sale calendar and act early
- Compare by effective cost after rewards: looking not only at the list price but at your actual cost including point rewards can sometimes bring a suitcase or battery one grade higher within your budget. Reward rates and award caps change easily, so check the latest terms on each official site
- Separate “things you’ll use for a long time” from “things closer to disposable”: treat suitcases and chargers as an investment you use for years and prioritize quality, while travel-size bottles and compression bags are cheap to try, so keep what suits you. Putting emphasis where it counts raises your satisfaction
Reward rates, campaign conditions, annual fees and the like change over time, so the figures in the text are only a guide to how to think about it. Before you actually buy, always check the latest terms on each online shop’s or service’s official page.
What to look for in warranty and support so you’re not stuck when something breaks
Travel gear is the kind of tool that causes more trouble when it breaks on the trip than right after you buy it. And since it breaks while you are on the move, you have to deal with it on the spot. Here are the points worth checking before you buy, item by item.
Suitcase: which parts does the warranty cover?
For a suitcase maker’s warranty, look not only at the period but at the scope of coverage. In most cases what is covered is manufacturing defects and faulty materials, and scratches and dents to the exterior caused by airline handling are not covered. Get this wrong and you’ll be turned down when you inquire after returning home.
In practice, three points matter.
- Whether wheel replacement is supported. Wheels wear out the most, so whether replacement parts are supplied greatly affects lifespan
- Whether the handle (telescoping bar) can be repaired. Problems like the sections catching or stopping partway appear relatively early in use
- Whether the repair desk is in Japan. Even with an overseas brand, things go quickly if a domestic distributor handles it, but if it has to be sent directly overseas, it becomes impractical
When it arrives, first roll the wheels while it is empty, extend and retract the handle through every stage, and run the zipper all the way around. If there is a TSA lock, also check that it opens and closes with the default code. If the lock won’t open, you can’t get at the contents. The trick is to do this check before packing. Once it is packed, it is harder to return even for an initial defect.
Power banks: recall information and signs of swelling
A lithium-ion battery is a consumable whose performance declines with age. Even with a warranty, “the capacity has dropped” is usually not covered; clear defects such as failing to charge or overheating are.
When buying, look for the PSE mark. Power banks are subject to Japan’s Electrical Appliance and Material Safety Act, and products without the mark cannot be legitimately sold in Japan. Check whether the mark and the business operator’s name are displayed.
Once you start using it, you need to decide to stop if the following signs appear.
- The body is swollen and wobbles when placed on a flat table
- It gets too hot to hold while charging
- It empties quickly even after a full charge, or doesn’t start charging
Bringing a swollen battery on board is dangerous and you may be refused. Run it through a full charge at least once before your trip and check how it behaves for peace of mind. If you need to dispose of it, don’t put it in ordinary municipal trash; use a designated method such as a recycling collection box.
Plug adapters and chargers: working out why “it didn’t work”
With a plug adapter for overseas, it is hard to tell whether a failure to fit locally is a defect or a wrong choice. Even within one country, outlet shapes can differ by the age of the building, and in reality it is often not a problem with the product.
Before departure, try once to see whether you can charge through the plug adapter at a Japanese outlet, and initial defects such as poor contact will be found in advance. With a multi-type adapter, also move the pins to check that each shape’s pins extend properly and lock in place.
The return and exchange deadline runs out “before the trip”
The most troublesome thing with travel gear is that the return window can end before you leave on the trip. If you buy early for a trip several months away, it is common for the deadline to have passed by the time you actually use it.
- Open it the day it arrivesDon’t leave it in the box until departure day. Scratches on the outer packaging or missing items can’t be found unless you open it
- Test it the way you will really use itPack the suitcase with actual clothes and lift it; charge a real phone with the battery
- Keep the accessories and warranty cardKeep spare parts for the wheels, keys and your purchase history together in one place
- Report defects within the deadlineDon’t wait to “decide after using it on the trip”; reach your conclusion before the deadline arrives
If a checked suitcase is damaged, the claim goes to the airline, not under the manufacturer’s warranty. In many cases, the condition is that you report it before leaving the airport, so get into the habit of checking the exterior when you pick it up.
Frequently asked questions
Can I bring a power bank on a plane?
Power banks contain lithium-ion batteries, so for fire-risk reasons the rule is that they can’t go in checked baggage and must be carried on board. There are also limits on whether you can bring them and how many, depending on capacity (Wh rating), so check your airline’s rules in advance. Choosing a product with a clearly visible capacity rating makes screening smoother. You use your phone a lot on a trip for maps, checking bookings and the camera, so having one with generous capacity and output gives peace of mind.
Can I bring lotion and sunscreen on board?
Liquids such as lotion, sunscreen and toothpaste have a volume limit per container in carry-on baggage, and the basic rule is to put them together in a clear bag (especially strict on international flights, with different practices on domestic flights). Large bottles taken as they are tend to get stopped at screening, so it is safer to decant into small containers or send bulkier items in checked baggage. For a final answer on what is allowed, check your airline’s guidance.
How do I decide on the size of a suitcase?
The approach least likely to fail is to start from the number of days. Go with a carry-on size for 1–2 nights to travel light, mid-size for 3–5 nights, and a large checked suitcase for about a week, working back from the days. A suitcase that’s too big makes you pack more and end up heavier, so aim for capacity that is “just right for the number of days,” not “better safe than sorry.” Leaving 10–20% of space free for souvenirs avoids a bag that won’t close on the way home.
What are some tips for packing lighter?
The basic approach is to narrow down by “I’d be in trouble without it,” not “it would be handy.” Toothbrushes, slippers and toiletries can often be replaced by hotel amenities and are also available at local convenience stores, so they are candidates to cut. Choose clothes you can mix and match, and reduce bulk with compression bags or sorting pouches. Moving heavy items to the bottom, on the wheel side, of the suitcase adds stability. The lighter you are, the more comfortable getting around and sightseeing become, and you also gain room for souvenirs.
How can I avoid forgetting my charger and cables?
If you store your charger, cable and power bank separately, “I forgot just the cable” tends to happen. Keeping them together in one small pouch makes them harder to forget, keeps them from being scattered at the hotel and saves time searching. Overseas, put the plug adapter in the same pouch. If you can see the contents of the pouch at a glance before departure, you can prevent most of the mishaps that cause travelers the most trouble: being unable to charge at your destination.
What preparations differ most from a domestic trip when traveling abroad?
The big differences from a domestic trip are your passport and visa, a plug adapter that fits the outlets at your destination, a way to get online such as a local SIM, eSIM or rental Wi-Fi, and local currency and a card that works overseas. For power, check voltage compatibility as well as the plug adapter. Take more regular medication than usual, and English information helps at checks or medical visits. Spread your valuables out rather than keeping them in one place, and carry copies of your passport and tickets separately for peace of mind in an emergency.
What should I do if my suitcase lock won’t open while traveling?
First, reset the dial to the default such as 0000 and try again, and if it still won’t open, don’t force it. At an airport, you can sometimes ask staff for help. To prevent this, write the code down on paper as well, not only in a phone note, and always check that it opens and closes once before you leave. With a zippered case there is a way to open it from the side, but you won’t be able to use it afterward.
How many power banks can I bring on board?
Handling depends on capacity: those above a certain capacity are subject to quantity limits or require airline approval. Ordinary palm-size ones can often be brought in multiples, but the upper limit is set by each airline. Check the guidance of the airline you will fly before departure, and bring ones whose capacity marking is legible.
Do compression bags make luggage lighter?
No. A compression bag reduces only the volume of air, so the weight doesn’t go down; it actually goes up by the weight of the bag. They help when you pack bulky down jackets or sweaters to fit them in a suitcase. On routes with strict weight limits, compressing and overpacking can result in excess baggage fees, so be careful.
What is a realistic option when souvenirs bought locally don’t fit?
The easiest way is to put a foldable secondary bag in from the start. If it is small enough to fit within the carry-on item allowance, you can bring it with no extra charge. If it still doesn’t fit, you will need to ship it from where you are or request an extra checked bag at the airport, but same-day requests tend to cost more, so if your airline allows advance booking, arranging it first gives peace of mind.
Do I need a plug adapter for domestic trips too?
Not within Japan. Outlet shapes and voltage are uniform across the country, so you can use things as they are. However, some lodgings have few outlets or only ones far from the bed. Bringing a short extension cord or a multi-port USB charger makes it less likely that family or group members end up waiting to charge.
* This article is for reference only. Sale dates, point rates and campaign terms can change, so check each store's official page for the latest details.