knapsack

A bag made of sturdy material and furnished with shoulder straps, designed for carrying articles on the back.

A case or bag of leather or strong cloth for carrying a soldier’s necessaries, closely strapped to the back between the shoulders; hence, any case or bag for similar use.

A case of canvas, leather, nylon, or other sturdy fabric, fitted with straps, for carrying on the back the food, clothing, or other supplies for a soldier or a traveler.

A case of canvas or leather, for carrying items on the back.

To go hiking while burdened with a knapsack, usually overnight (or longer.)

a bag carried by a strap on your back or shoulder