mailbag
1. [ noun ] pouch used in the shipment of mail
Synonyms: mail_pouch
Related terms: pouch diplomatic_pouch
2. [ noun ] letter carrier's shoulder bag
Synonyms: postbag
Examples:

"in England they call a mailbag a postbag"

Related terms: bag
Similar spelling:   Malpass
  mailbox
  Mallophaga
  malvasia
  malpighi
  Malpica
  Malvaceae
  Malpighia