Backpack
A backpack is a Sac which one transfers onto his Dos. In its simplest form, it is supported by belts resting on the shoulder S and sticking under the arm.
Initalement used for the Alpinism and the Excursion, the backpack is used today for many activities, as soon as it requires to transport a load by keeping the freehands. It thus became a Bagage with whole share. For the heavy loads, the straps are accompanied by a broad rembourée belt, in order to distribute part of the load on the Hanche S. a small elastic strap can also prevent that the straps do not deviate involuntarily.
Constituted primarily of Fabric (today generally in Nylon or equivalent), the backpack can be rigidified by metal plates (generally in Aluminum to remain light) even constant by a Claie. The various models are characterized by their capacity (expressed in Liter S), their form adapted to the transport of various objects, and the variable number of pockets, Sangle S, fasteners and carries Piolet which they comprise. Certain models are equipped with a flexible Gourde. There exist also models especially stuffed for the transport of a Laptop.
See too
- the mathematical problem of the backpack
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