HAVERSACK

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

haversack (plural haversacks)

A small, strong bag carried on the back or the shoulder, usually with only one strap, and originally made of canvas.

(archaic) An oat-sack, or nosebag for a horse.

Source: Wiktionary

Hav"er*sack, n. Etym: [F. havresac, G. habersack, sack for oats. See 2d Haver, and Sack a bag.]

1. A bag for oats or oatmeal. [Prov. Eng.]

2. A bag or case, usually of stout cloth, in which a soldier carries his rations when on a march; -- distinguished from knapsack.

3. A gunner's case or bag used carry cartridges from the ammunition chest to the piece in loading.

Source: Webster’s Unabridged Dictionary 1913 Edition