: a pack (see pack entry 1 sense 1a) that usually has two shoulder straps and is carried on the back: such as
: a large pack (as of canvas or nylon) that is supported by an external or internal frame (as of aluminum) and is used especially for carrying supplies when hiking and camping
: a bag or small pack (as of canvas, polyester, or nylon) used for carrying personal belongings or supplies : knapsack
: a load carried on the back
: a piece of equipment designed for use while being carried on the back
: to carry (food or equipment) on the back especially in hiking
: to hike with a backpack