Backpacks

An internal-frame pack has a large cloth section in which a small frame is integrated. This frame generally consists of strips of either metal or plastic that mold to one's back to provide a good fit, sometimes with additional metal stays to reinforce the frame. Usually a complex series of straps works with the frame to distribute the weight and hold it in place.

The close fitting of the back section to the wearer's back allows the pack to be closely attached to the body, and gives a predictable movement of the load; The internal construction also allows for a large storage compartment. In addition, because of their snug fit, they ride better in activities that involve upper-body movement such as scrambling over rocky surfaces and skiing. The improved internal frame models have largely replaced external frame backpacks for many activities.

In North America, pack size is measured in cubic inches. Your backpack size depends on how long you will be hiking, the climate, how much gear you take and your body size. A large pack is usually between 4,500 to 6,000 cubic inches.
. Compared to backpacks used for more day-to-day purposes such as schoolbooks, backpacks are designed to carry substantially heavier loads. As a result most packs attach not only at the shoulders but at the hips, using a padded hip belt to evenly distribute the weight of the pack to the legs and back for better balance and comfort (this is a must for long hikes and extensive trips through trails.) The often heavily padded and sometimes semi-rigid shoulder straps are mainly for balancing the weight. They usually (except for those used in ultra-light backing) have a metal or plastic frame to support and distribute the weight of the pack. Larger packs of this type tend to have a subdivided main compartment.

These trekking packs often have several pockets on the outside. They may also have lash points on the exterior (either directly attached to the frame or webbing loops), so that bulky items may be strapped on, although depending on the pack design and type of trek most backpackers will try to stuff everything into the pack for better maneuverability.

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