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.
Rachel discovered that she could also keep things in her backpack that were important to her, nobody would know about them because they would be hidden. These important things included a small round rock that she had found […]2011, Thelma J. Miller, What's in Your Backpack?, page 8:
Many seats carry reservation labels, while the luggage racks are festooned with backpacks and suitcases.2022 November 30, Paul Bigland, “Destination Oban: a Sunday in Scotland”, in RAIL, number 971, page 77:
2
A similarly placed item containing a parachute or other life support equipment.