On the Japanese Shinkansen (Bullet Train), including the premium Green Car, the standard luggage allowance is officially limited to two pieces of baggage, with each bag weighing no more than 30 kg (66 lbs). The total dimensions (length + width + height) of each bag must not exceed 250 cm, and the length must be under two meters. However, a critical "160 cm rule" applies to the Tokaido, Sanyo, and Kyushu lines: any bag with total dimensions between 160 cm and 250 cm is classified as "oversized" and requires a mandatory, free reservation for a "seat with an oversized baggage area." In the Green Car, because there are footrests, you cannot store bags under the seat; you must use the overhead racks, which typically accommodate bags up to 160 cm. If you board with oversized luggage without a reservation, you will be charged a ¥1,000 fee (approx. $7 USD) and may be required to move your bag. For the most comfortable experience in 2026, many Green Car passengers choose to use "Takkyubin" (luggage delivery services) to ship their large suitcases between hotels, allowing them to travel with just a small carry-on.