Yes, you can bring luggage on the Shinkansen (Japanese bullet train) in 2026, but there are specific rules regarding "Oversized Baggage." Any bag with total dimensions (length + width + height) between 160 cm and 250 cm is classified as oversized. To bring such a bag on the Tokaido, Sanyo, or Kyushu Shinkansen lines, you must make a reservation for a seat with a designated baggage area (usually the last row of a car). This reservation is free if made at the time of ticket purchase, but if you board with an oversized bag without a reservation, you will be charged a ¥1,000 "carry-on fee" and the bag may be moved to a different location by the conductor. Bags smaller than 160 cm do not require a reservation and can be stored on the overhead racks, which are surprisingly deep and can accommodate most standard suitcases. It is important to note that bags exceeding 250 cm are strictly prohibited from the Shinkansen entirely. For travelers with multiple large suitcases, the "pro-tip" remains using a "Takkyubin" (luggage delivery service) to ship bags from hotel to hotel, allowing you to travel on the bullet train with just a small daypack for maximum comfort.