KNAPSACK
backpack, back pack, knapsack, packsack, rucksack, haversack
(noun) a bag carried by a strap on your back or shoulder
Source: WordNet® 3.1
Etymology
Noun
knapsack (plural knapsacks)
(chiefly, US) A case of canvas or leather, for carrying items on the back.
(cryptography) A set of values from which a subset is chosen.
Synonyms
• backpack
• rucksack
Verb
knapsack (third-person singular simple present knapsacks, present participle knapsacking, simple past and past participle knapsacked)
To go hiking while burdened with a knapsack, usually overnight or for longer.
Synonyms
• backpack
Source: Wiktionary
Knap"sack`, n. Etym: [D. knapzak; knappen to eat + zak a bag. See
Knap, v. t., and Sack.]
Definition: A case of canvas or leather, for carrying on the back a
soldier's necessaries, or the clothing, etc., of a traveler.
And each one fills his knapsack or his scrip With some rare thing
that on the field is found. Drayton.
Source: Webster’s Unabridged Dictionary 1913 Edition