By Samuel FergusonA backpack is a cloth sack that is usually secured over the shoulders. This is used to carry reasonably heavy loads that are difficult to be carried in the hands for a long time. There are the smaller backpacks that have one strap going over the shoulder. This is for carrying loads that are not too heavy. The larger backpacks carry heavier loads and are secured over the shoulder by two straps. Some backpacks have padded hip belts for transferring the load to the hips. This is useful when the load weighs more than 22 lbs. The hips can withstand more load than the shoulders.
