Pack the bag you can manage on the busiest day of your Japan trip. That might be checkout, a train change and a walk to an unfamiliar hotel, all before lunch. Start with what needs to stay in your hand on that day. Then add clothing for the places you will visit and leave out anything your accommodation already provides.
Put the first journey in a small bag
Keep your passport, payment card, some yen, phone, charging cable and the first accommodation address together but secure. Save the name and address in Japanese if the property provides it, alongside an offline copy of the route and reservation. Write the essential details on paper too if your phone is your only copy. Japan’s national tourism organisation recommends carrying some cash; do not make a single card or a working phone your only way to pay on arrival.
Separate the items you need during the first night from anything you might send ahead. If you intend to use luggage delivery, ask both ends of the journey about acceptance, cutoff time and delivery date. A change of clothes and essential personal items belong with you until you know when the larger case will arrive.
Measure the suitcase for the actual train
For an ordinary suitcase, add the outside height, width and depth. This differs from checking an airline’s separate dimension limits. JR Central explains oversized luggage on the Tokaido, Sanyo and Kyushu Shinkansen: if the total exceeds 160 cm, check the required seat and baggage reservation for your specific service and class. For example, a hypothetical 75 × 50 × 40 cm suitcase totals 165 cm. An airline accepting it as checked baggage does not settle the train question.
Do this before fixing your seat reservation, not on the station platform. If your itinerary uses other trains, check that operator’s guidance. If you plan to leave a case at a station, find a staffed or alternative option in case no suitable locker is free; do not plan a tight connection around an unreserved space.
Choose clothes for the stops, not the country
List the cities, elevations and activities on your itinerary. Look up the actual forecasts near departure using the Japan Meteorological Agency’s forecast services. Lay out one outfit that works for a transfer day, then add layers for the colder or wetter parts of your own route. Check what your first accommodation supplies before packing towels or nightwear. Do not rely on the next property offering the same things.
Wear shoes you already know you can walk in with luggage. Plan a wash and drying stop if that lets you bring fewer outfits. Keep something dry outside the main case for the night you send it on or leave it in storage.
Check electronics and medicines before closing the bag
JNTO’s electricity guide gives Japan’s supply as 100 V, with frequency varying between east and west. Read the input rating on each charger or appliance. A plug adaptor changes the fit, not the voltage. Leave an incompatible appliance at home unless you have the right equipment and manufacturer guidance.
For medicines, compare the active ingredient, quantity and form with Japan’s Ministry of Health guidance. Some require advance procedures; a home prescription is not blanket permission to import them. Resolve questions with the relevant authority before departure. Put permitted essentials and any required paperwork in the bag that stays with you.
Sources checked on 5 November 2026.