I. ˈbak-ˌpak noun
Date: 1914
1.
a. : a load carried on the back
b. : a camping pack (as of canvas or nylon) supported by a usually aluminum frame and carried on the back
c. : knapsack
2. : a piece of equipment designed for use while being carried on the back
II. verb
Date: 1927
transitive verb
: to carry (food or equipment) on the back especially in hiking
intransitive verb
: to hike with a backpack
• back·pack·er noun