/ Thesaurus / P Synonyms of post bag Find synonyms for: Noun1. mailbag, postbag, bagusage: letter carrier's shoulder bag; "in Britain they call a mailbag a postbag"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language