noun
Boston bag; overnight bag; travel bag
A soft, usually rectangular carry-on bag with handles, often used for short trips or as a gym bag. The term is a wasei-eigo borrowing from English.
週末の旅行にボストンバッグを持っていく。
I take a Boston bag for a weekend trip.
ジムに行くときはボストンバッグに着替えを入れる。
When I go to the gym, I put a change of clothes in my Boston bag.