The "best" seat on the Shinkansen in 2026 depends on whether you want a view or need to manage luggage. For travelers heading from Tokyo to Kyoto/Osaka, the "gold standard" for a view is Seat E (the window seat on the 2-seat side), as it offers the iconic view of Mount Fuji about 40–45 minutes into the journey. If you are traveling in the opposite direction (toward Tokyo), you should book Seat A. For those with large suitcases, the best seats are in the last row of any car; in 2026, you must specifically reserve a "Seat with Oversized Luggage Space" to use the area behind these seats on the Tokaido, Sanyo, and Kyushu lines. This reservation is free but mandatory for bags with a total dimension over 160 cm. For maximum comfort, the "Green Car" (first class) offers a 2-2 layout with significantly more legroom and footrests, though the standard car's 3-2 layout is already more spacious than most international flight economy seats, making any window seat a great choice for a high-speed journey.