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For the personal information manager Backpack, see 37signals.

A backpack (also knapsack or, especially in the UK, rucksack, haversack, or packsack) is, in its simplest form, a cloth sack carried on one's back and secured with two straps that go over the shoulders and below the armpits.

Backpacks are often preferred to handbags for carrying heavy loads for long periods of time, because the shoulders are better suited for bearing heavy weights for long periods of time than the hands are. However, large backpacks usually offload part of their weight onto padded hip belts. This improves ease of carrying, because the hips are even stronger than the shoulders, and increases agility, because the load rides nearer the person's own center of mass.

Most backpacks are made from soft materials, but the Boblbee company has introduced a popular product line made with hard (monocoque) shells.

Special-purpose backpacks

It is not uncommon to see backpacks specifically designed to carry certain items. Common examples include backpacks for small, high-value items such as laptop computers and cameras (see left). It is also possible to buy "picnic basket" backpacks that come with plastic dishes and utensils, a tablecloth, etc.

Backpacks for backpacking

Backpacks designed for backpacking (often just called packs) are more complex than ordinary varieties. Packs generally have many pockets on the outside, and the main compartment may even be subdivided. They usually have lash points on the exterior, so that bulky items may be strapped on. Packs typically stand about 3 feet (1 m) tall.

Packs come in two main types. The external-frame design—in which a pack is attached to a rigid external frame—is the older of the two, wooden frames having been used to carry packs for centuries in various places around the world.^{[citation needed]} Metal versions (usually made of aluminum for its light weight) first appeared in the mid-20th century. The frame typically has a system of straps and pads to keep the sack and the metal parts from contacting the body, with the added benefit of improved ventilation and decreased sweatiness. The fabric part of the pack is stretched along part of the frame's length, but the frame typically protrudes above and below. The main compartment is smaller than that of internal-frame packs, because bulky items (tents, sleeping bags, thermal pads) are strapped to the parts of the frame not obscured by the main compartment itself.

The frame of an internal-frame pack is contained entirely inside the pack and consists of strips of either a specially designed polymer or a metal that molds to one's back to provide a good fit. Usually a fairly 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 it is difficult to lash a large item so that it stays rigid and does not bounce. Sleeping bags are a particularly difficult case, as they are very bulky and take up a large part of an internal-frame pack's storage space. Compression sacks are used to alleviate the problem, allowing sleeping bags to be reduced in size dramatically.

External-frame packs have historically boasted better load capacity and greater comfort for steady walking, but internal-frame models have improved greatly in these respects. Internal-frame packs are also better suited for activities that involve upper-body movement than external-frame packs, and today internal-frame packs are more common. External-frame models have vanished completely from the British Isles,^{[citation needed]} but in the United States, some manufacturers continue to produce them.

See also

• Backpacking
• All-purpose Lightweight Individual Carrying Equipment (ALICE)
• MOLLE
• Hydration pack

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