Etymology
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mailbag (n.)

also mail-bag, "bag in which the public mail is carried," 1794, from mail (n.1) + bag (n.). Mail-pouch in the same sense is by 1838. The Mail Pouch chewing tobacco brand painted its advertisements on barns across the middle of the U.S. from 1891 to 1992.

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Definitions of mailbag

mailbag (n.)
pouch used in the shipment of mail;
Synonyms: mail pouch
mailbag (n.)
letter carrier's shoulder bag;
in Britain they call a mailbag a postbag
Synonyms: postbag
From wordnet.princeton.edu