/ Thesaurus Find synonyms for: Noun1. backpack, back pack, knapsack, packsack, rucksack, haversack, bagusage: a bag carried by a strap on your back or shoulderWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: rucksack (Dictionary) Related Content Daily Word Quiz: sublime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index