Backpacking backpacks, or packs, come in two main models: internal-frame and external-frame. In additional to the two shoulder straps, modern packs always have a padded hip belt. The hip belt carries most of the pack's weight, because the pelvis is sturder than the structure of the shoulders; this also lowers the hiker's center of gravity. Packs generally have many pockets, and the main compartment may even have vertical sub-compartments. Almost all packs, especially external-frame models, allow bulky items to be strapped to the outside. Packs are typically about 3 feet (1 m) tall.
The frame of internal-frame packs is contained entirely inside the pack and consists of strips of a specially designed polymer that molds to one's back to provide a good fit. Internal-frame packs are best suited for skiing and other forms of locomotion involving upper-body movement, but have become increasingly popular for ordinary backpacking as well. In Great Britain, internal-frame packs have completely supplanted external-frame models.
Some sleeping bags come with special sacks with straps on the outside, enabling the bag to be squeezed enough to fit into an internal-frame pack.
Comparison of backpack models | |
---|---|
External frame | Internal frame |
Large metal frame to which the pack is secured | Highly reduced semirigid frame in the inside of the pack |
Good ventilation | Tight fit and less bouncing |
Large capacity for bulky strap-on items | Roomy internal storage |
May cost approximately US$150 | May cost approximately US$200 |
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