Shinkansen Oversized Luggage Rules 2026: When to Book a Seat

On Japan’s Shinkansen, any bag whose length, width and height add up to more than 160cm (about 63 inches), wheels and handles included, counts as oversized baggage. Bags up to 250cm (about 98 inches) are allowed, but on the Tokaido, Sanyo, Kyushu and Nishi-Kyushu Shinkansen you must reserve a “seat with oversized baggage area” in advance. The reservation costs nothing extra. Board without one and the conductor charges you ¥1,000 and decides where your bag goes. Anything over 250cm is not allowed on the train at all.

So does a 28-inch suitcase need a booking? Usually not. Most 28-inch models from major brands measure 156–158cm in total, just under the limit, while 30-inch cases almost always go over. Two more things catch travelers out: oversized bags are not allowed in non-reserved cars, and they cannot go in the free “deck luggage area” between cars, despite its Japanese name. On the Tohoku, Joetsu, Hokuriku and Hokkaido Shinkansen, no reservation is needed at all.

Measure First: Is Your Suitcase “Oversized”?

How to Measure Your Bag

Measure the outside of the bag at its widest points. Height runs from the bottom of the wheels to the top of the retracted handle, and depth includes any side handle. Brands usually list these external dimensions on their official spec pages, and both RIMOWA and Samsonite state that their figures include wheels and handles. Interior or “body” dimensions on shopping sites won’t help you here.

Watch out for expandable cases. A Samsonite Upscape 81 measures 169cm normally, but unzip the expander and the depth grows from 34cm to 71cm, taking the total to 206cm. If you expand your bag for souvenirs later in the trip, a case that didn’t need a booking on the way out might need one on the way back.

Real Sizes of Popular Suitcases

Suitcase “inches” are a loose industry label, and two 28-inch cases from different brands can have quite different dimensions. The table below uses the external dimensions published on each brand’s official site, so you can see where the line actually falls.

The pattern is clear. Cases around 75cm tall (roughly 28 inches) mostly come in just under 160cm, while 81cm cases (roughly 30 inches) go over by about 10cm. The RIMOWA Trunk Plus is the odd one out: it stands 80cm tall and holds over 100 liters, yet its narrow, deep shape keeps the total at 158cm. Rather than guessing from inches or liters, check the official external size of your own model.

Which Shinkansen Lines Require a Reservation?

Line-by-Line Comparison

The rule applies to the lines run by JR Central, JR West and JR Kyushu. They form one continuous route through Tokyo, Nagoya, Kyoto, Shin-Osaka, Hiroshima, Hakata and Kagoshima-Chuo, so if your trip touches any part of it, the same rule applies.

JR East lines follow a different rule. There is no booking and no fee, but each bag must stay within 250cm in total, 2m in length and 30kg in weight, with a maximum of two bags per person, according to JR East’s luggage guide. You can’t reserve the luggage areas, so in busy seasons it helps to get to the platform early and board near the front of the line.

Keep in mind that oversized-baggage seats are limited. According to JR Central’s 2025 notice, a 16-car train has 57 of these seats on the Nozomi, 42 on the Hikari and only 17 on the Kodama. Many travelers assume the slower Kodama is the easy option, but it has the fewest luggage seats, so book early if you’re taking one. JR Central’s oversized baggage page has the full rules.

Two Common Mix-Ups: Non-Reserved Cars and the Deck Luggage Area

First, oversized bags are not allowed in non-reserved cars. JR Central states this plainly: oversized baggage cannot be brought into non-reserved cars or reserved cars without oversized-baggage seats. If you’re wheeling a 30-inch case, you can’t just hop on the next train’s non-reserved car. You need a booking.

Second, the names are confusing. Until June 2025, the Tokaido and Sanyo Shinkansen sold two kinds of seats for big luggage. One is the last-row “seat with oversized baggage area” (特大荷物スペースつき座席) described above. It is still sold today, and it’s the one you need for an oversized bag. The other was a “seat with oversized baggage corner” (特大荷物コーナーつき座席), which came with a spot on a luggage shelf in the deck area between cars. That second type stopped selling on July 1, 2025.

Since then, those deck shelves have been free for anyone to use, no booking needed, as a trial. JR says it will announce when the trial ends, and no end date had been announced as of October 2026. You’ll find them at the ends of cars 3, 5, 7, 9, 13 and 15 on 16-car trains. Here’s the catch: even though the sign says “特大荷物” (oversized baggage), bags over 160cm cannot be stored there. They’re meant for 26–28-inch cases that won’t fit on the overhead rack.

How to Book an Oversized-Baggage Seat

Three Ways to Book

An oversized-baggage seat costs the same as a regular reserved seat. The only difference is choosing the right seat type when you book. Here’s how the options compare:

On busy days these seats often sell out as soon as they go on sale, so book as soon as your dates are fixed. JR reserved seats generally go on sale one month before the travel date.

Booking with Smart EX, Step by Step

Smart EX is the online booking service run jointly by JR Central, JR West and JR Kyushu for the Tokaido, Sanyo and Kyushu Shinkansen. Booking takes four steps: search conditions, train and seat selection, confirmation and completion. The key is to choose the oversized-baggage seat in the very first step, not when you pick your seat.

After signing in, enter your travel date, departure time, departure and arrival stations, and number of passengers. Below these is a “Seat type” (座席の種類) drop-down menu set to “No preference” (指定なし) by default. Change it to “Seat with oversized baggage area” (特大荷物スペースつき座席) and search.

Next, choose your train. The availability shown now refers to oversized-baggage seats only. On the seat map, only the last row of each car can be selected and every other seat is crossed out. In car 16 of an N700-series train, for example, only row 15 is open, and seats already taken in that row are crossed out too.

Pick your seat, confirm and pay, and you’re done. On the day, tap your registered IC card at the gate, or collect a paper ticket from a station machine. For more on booking seats, see How to Reserve Shinkansen Tickets in Japan.

Booking with a JR Pass

If you bought your JR Pass on the official Japan Rail Pass website, you can reserve seats on the JAPAN RAIL PASS Reservation site, where “Seat with oversized baggage area” is one of the seat options. You can do this even before you pick up your pass. In Japan, collect the seat ticket at a reserved-seat ticket machine or ticket office by scanning your QR code or entering your reservation number, then your passport number.

If you’re already in Japan and haven’t reserved yet, you can book at a reserved-seat ticket machine or ticket office. Just make sure to choose the oversized-baggage seat. For the full process of using a JR Pass on the Shinkansen, see our Japan Shinkansen Ticket Purchase & Riding Guide.

Forgot to Book, or Seats Sold Out?

If You Board Without a Booking

Don’t panic. You won’t be thrown off the train. The conductor will charge a ¥1,000 handling fee (tax included) and store your bag in a place of their choosing, which may not be near your seat, so remember to collect it before your stop.

Don’t try to avoid the fee by squeezing a large case at your feet or in the aisle. Legroom on the Shinkansen is limited, a blocked aisle gets in other passengers’ way and is a safety hazard, and the conductor will probably ask you to move it anyway.

Backup Plans When Trains Are Full

The simplest fix is to take an earlier or later train. The Hikari has more oversized-baggage seats than the Kodama, so if the timing works, try the Hikari first. If nothing is available, or you’re changing trains several times, consider sending your bag ahead to your next hotel by luggage delivery and traveling light.

Also note that from fiscal 2026, the Nozomi runs all-reserved on more days. On top of Golden Week, Obon and the New Year period, it now includes Silver Week in September and three-day weekends from October to March. Even regular seats are hard to get on these days, so book oversized-baggage seats as early as you can.

One Last Tip Before You Go

With Smart EX, booking, changing and checking your seat all happen on your phone. If your plans shift, say sightseeing runs long and you want a later train, you can usually switch to another train on the same route for free before departure, as long as your phone is online.

FAQ