Do I need to book oversized baggage space on the Shinkansen?
In general, cabin-size luggage can be brought without reservation. For oversized luggage, an oversized luggage space reservation is required only on the Tokaido, Sanyo, and Kyushu Shinkansen lines.
Refer to the image below for the size limits:

If the total dimensions of your luggage exceed 250 cm, you may not be able to travel with it.
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Other FAQs in "Japan trains"
- How do I pick up my JR train tickets?
- How do I cancel or change my JR train ticket?
- If I miss my Shinkansen or JR Express train, should I buy a new ticket?
- What are reserved seats and non-reserved seats?
- Who's eligible to buy child train tickets?
- Are there child tickets for Shinkansen Green Cars?
- How do I read my physical train ticket?