1. A large bag or sack used by postal services to collect, transport, and deliver mail
The postal worker emptied the mailbag at the distribution center.
O carteiro esvaziou a mala postal no centro de distribuição.
2. A secure container used for transporting official documents or correspondence between government offices or diplomatic missions
The diplomatic pouch, also called a mailbag, crossed the border safely.
A mala postal diplomática atravessou a fronteira com segurança.