Backpacks in general fall into one of three categories: frameless, external frame, and internal frame. A backpack frame, when present, serves to support the pack and distribute the weight of its contents across the body more easily (generally by transferring much of the weight to the hips and legs), so most of the weight does not rest on the shoulders, restricting range of motion and possibly causing damage from pressure on the straps.
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Sports Fan Backpacks |
View These Other Camping Sites:
KOA Kampgrounds of America | Camping
USA | National Park Service