Backpack also known as rucksack, knapsack, packsack; pack is the simplest form of cloth sack that can be carried on the back and can be secured with two straps that go over the shoulders but sometimes are also worn on only one shoulder. They are often preferred over handbags for carrying heavy luggage because it distributes the load all over instead of putting pressure on a confined region.
As hips are stronger than the shoulders, for large backpacks weight is mainly distributed over the hip region and shoulder straps serve the purpose of stabilizing the load thus increasing the potential to carry heavy loads.
History of backpacks says that these sacks at that time were used to carry the hunter's prey and proved to be an easier way to transport other materials. Bags were made up of hide and skin of different animals. They were later sewn together tight and thus got transformed into a thread like material.
The term 'backpack' was given in the United States in 1910s. In general, these carriages are divided into four categories, namely frameless, external frame, internal frame and body pack. Most backpacks come with the buckle mechanism closure option, although zipper or card lock are also much prevalent. They are available in a wide range of colors.