noun
oversized baggage
Refers to luggage that exceeds standard size limits, especially in the context of trains, buses, or flights.
新幹線では特大荷物を事前に予約する必要がある。
On the Shinkansen, you need to reserve space for oversized baggage in advance.
Compound of 特大 (tokudai, 'extra-large') + 荷物 (nimotsu, 'baggage').