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bring-your-own (e.g. food and drink); carry-on (e.g. luggage)
持ち込みは禁止です。
Bringing your own food is not allowed.
食べ物の持ち込みを許可している会場だ。
It's a venue that allows you to bring your own food.
スーツケースを持ち込みで機内に乗った。
I boarded the plane with my suitcase as carry-on.