backpack

Short definition from Wiktionary

Noun

1. 1
   A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.
2. 2
   A similarly placed item containing a parachute or other life-support equipment.

Verb

1. 1
   To hike and camp overnight in backcountry with one's gear carried in a backpack.
2. 2
   To engage in low-cost, generally urban, travel with minimal luggage and frugal accommodation.
3. 3
   To place or carry (an item or items) in a backpack.