noun
commuter bag; work bag
A bag used for commuting to work, typically a briefcase, tote, or backpack carried daily.
新しい通勤カバンを買った。
I bought a new commuter bag.
通勤カバンに弁当と書類を入れる。
I put my lunch and documents in my work bag.
ビジネスバッグ is a more formal term often implying a briefcase-style bag, while 通勤カバン is a broader, everyday term for any bag used for commuting.
Compound of 通勤 (commuting) and カバン (bag). The word カバン is a loanword from Portuguese 'capa' or Dutch 'kabas', but the exact derivation is uncertain.