Definitions of knapsack

  1. A case of canvas or leather, for carrying on the back a soldier's necessaries, or the clothing, etc., of a traveler.
  2. A case strapped across the shoulders, for carrying light luggage, etc.
  3. A sack containing necessaries of food and clothing, borne on the back by soldiers, travellers, & c.
  4. A provision- sack; a soldier's or traveller's bag carried on his back, containing food and necessaries of clothing.