mailbag

名词 mailbag:

1. pouch used in the shipment of mail
   同义词：mail pouch
2. letter carrier's shoulder bag
   同义词：postbag

mail.bag

n.（名词）
A large canvas sack used for transporting mail.
邮袋：用来运送邮件的大帆布袋
A bag suspended from the shoulder, used by letter carriers for carrying mail.
邮递袋：挂在肩上的布袋，邮递员用它来发送信件