Haversack /(hăv"ẽr*săk)/

Hav·er·sack

Haversack

n.
  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 to carry cartridges from the ammunition chest to the piece in loading.