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Backpack: Difference between revisions
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Packs come in two main types. | Packs come in two main types. | ||
The more traditional type uses a rigid, ''external frame'' which is strapped on the back and in turn carries and supports a cloth sack and potential strapped on items. Wooden pack frames have been used for centuries around the world,{{Fact|date=February 2007}} and metal versions first appeared in the mid-20th century. Modern pack frames are usually made from lightweight | The more traditional type uses a rigid, ''external frame'' which is strapped on the back and in turn carries and supports a cloth sack and potential strapped on items. Wooden pack frames have been used for centuries around the world,{{Fact|date=February 2007}} and metal versions first appeared in the mid-20th century. Modern pack frames are usually made from lightweight aluminium tubes. The frame typically has a system of straps and pads to keep the sack and the frame from contacting the body. The open structure has the added benefit of improved ventilation and decreased sweatiness. The fabric part of the pack occupies part of the frame's length, but the frame typically protrudes above and below. These areas of the frame allow bulky items (such [[tent]]s, [[sleeping bag]]s, and [[thermal pad]]s) to be strapped on. Thus the main compartment is smaller than that of an internal-frame pack, because bulky items ([[tent]]s, [[sleeping bag]]s, [[thermal pad]]s) are strapped to the parts of the frame not occupied by the main compartment itself. | ||
An ''internal-frame'' pack has a large cloth part in which a small frame is integrated. This frame can consist of strips of either a metal or specially designed [[polymer]] that molds to one's back to provide a good fit. Usually a complex series of straps works with the frame to distribute the weight and hold it in place. Internal-frame packs may provide a few lash points, but as the frame is fully integrated and not available on the outside, it is difficult to lash a large, heavy item so that it stays fixed and does not bounce, so most cargo must fit inside. | An ''internal-frame'' pack has a large cloth part in which a small frame is integrated. This frame can consist of strips of either a metal or specially designed [[polymer]] that molds to one's back to provide a good fit. Usually a complex series of straps works with the frame to distribute the weight and hold it in place. Internal-frame packs may provide a few lash points, but as the frame is fully integrated and not available on the outside, it is difficult to lash a large, heavy item so that it stays fixed and does not bounce, so most cargo must fit inside. | ||