noun
messenger bag
A type of crossbody bag originally used by bicycle messengers, often with a large flap and a single strap worn across the chest.
彼はいつもメッセンジャーバッグを肩にかけて通勤している。
He always commutes with a messenger bag slung over his shoulder.
Variant with interpunct; less common in everyday writing.
ショルダーバッグ is a general shoulder bag, while メッセンジャーバッグ specifically refers to the style with a large flap and crossbody strap associated with bicycle messengers.
Loanword from English 'messenger bag'.