noun 1.a
pack or knapsack, often of canvas or nylon, to be carried on one's
back, sometimes supported on a lightweight metal frame strapped to the body.
2.a piece of equipment designed to be used while being carried on the
back.
verb (used without object) 3.to go on a hike, using a backpack: We went backpacking in the Adirondacks.
verb (used with object) 4.to place or carry in a backpack or on one's
back.
Origin: 1910–15, Americanism;
back1 +
pack1 Related forms back·pack·er, noun