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Backpacks, Bags
A backpack is, in its simplest form, a cloth sack carried on one's back and secured with two straps that go over the shoulders, but there can be acceptions, there are many ways to carry backpacks one way is: carry it in one hand (like a breifcase). more...
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you can also use a backpack to hold water and other materials.
Backpacks are often preferred to handbags for carrying heavy loads, because the shoulders are better suited for bearing heavy weights for long periods of time than the hands. Large backpacks, used to carry loads over 10 kg, usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load. This improves the potential to carry heavy loads, as the hips are stronger than the shoulders, and also increases agility and balance, since the load rides nearer the person's own center of mass.
Terminology
The word backpack was coined in the United States in the 1910s. Knapsack and packsack were used before; they now occur mainly as regionalisms in North America. The word rucksack is a German loanword mainly used in the UK: 'der Rücken' means 'the back' (the part of the body) in German. Alternative names include Haversack, and Bergen (from the manufacturer's name Bergans, used for a rucksack supported by an external frame, usually associated with the British Armed Forces).
Backpacks can often simply be referred to as \"packs\", especially in outdoors contexts; though sometimes ambiguous compared to other bags such as saddlebags and duffel bags, context is generally sufficient for identification.
Backpack designs
Backpacks in general fall into one of three categories: frameless, external frame, and internal frame. A pack frame, when present, serves to support the pack and distribute the weight of its contents across the body more easily (generally by transferring much of the weight to the hips and legs), so most of the weight does not rest on the shoulders, restricting range of motion and possibly causing damage from pressure on the straps. Most are capable of being closed with either a buckle mechanism or a zipper, though a few models use a drawstring for the main compartment.
Frameless
The simplest backpack design is simply a bag attached to a set of shoulder straps. Such packs are used for general transportation of goods, particularly by students, and have variable capacity. The simplest designs have one main pocket combined with webbing or cordage straps; more sophisticated models add extra pockets, waist straps, padded shoulder straps, padded backs, and sometimes even reflective materials for added safety when the wearer is out at night. Such packs can be made inexpensively.
Read more at Wikipedia.org
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