Funny looking dog.
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 exceptions. There are many ways to carry backpacks. One way is to carry it in one hand (like a briefcase). 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
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
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