Backpacks—also called knapsack, rucksack, rucksac, pack, sackpack, or backsack—is, in its simplest frameless form, a cloth sack carried on one’s back and secured with two straps that go over the shoulders, but it can have an external frame, internal frame, and there are bodypacks. Large backpacks, used to carry loads over 10 kilograms (22 lb), as well as smaller sports backpacks (e.g. running, cycling, hiking and hydration), usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load. ackpacks can often simply be referred to as “packs”, especially in outdoors contexts; though sometimes ambiguous compared to other bags such as saddlebags and duffel bags, context is generally sufficient for identification.
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