noun 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.
noun A similarly placed item containing a parachute or other life support equipment.
verb To hike and camp overnight in backcountry with one's gear carried in a backpack.
I spent a month backpacking in the Rockies.
verb To engage in low-cost, generally urban, travel with minimal luggage and frugal accommodation.
verb To place or carry (an item or items) in a backpack.