A backpack (also called rucksack, knapsack, packsack, pack, or Bergan) 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. Light weight types of backpacks are sometimes worn on only one shoulder strap, or in the hand like an ordinary bag.

Backpacks are often preferred to handbags for carrying heavy loads, because of the limited capacity to carry heavy weights for long periods of time in 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.

In ancient times, the backpack was used as a means to carry the hunter's larger game and other types of prey as a way of easier transport. In the cases of larger hunts, the hunters would dismember their prey and distribute the pieces of the animal around each one packing the meat into many wrappings and then into a bag which they place on to their back. The bag itself was made up of different animal hide and skin (depending on what sorts of animals were in the area) and sewn together by the intestines of said animals, which were woven together tightly to make a sturdy thread-like material.

Click on the picture below for more information:

	Chapin 61800N Professional 4 - Gallon Backpack Poly Sprayer Average Rating:
	Back pack sprayer has 4" wide opening for ease of use and cleaning. Poly shut off. Pressure control 15 to 60 P.S.I. Adjustable cone or fan nozzle. Also contains a brass nozzle.

	All About Garbage & Recycling Average Rating:
	Join Backpack Jack and his friends as they dive into the big stinky and amazing story of garbage/ Take a road trip in a big old 18-wheeler and see what it s like to sleep in the cab hook up the trailer and even talk to other truckers on the CB radio! Scoop up big snow drifts in a snow plow...

	All About Dinosaurs Average Rating:
	Grab your gear and find out as Backpack Jack and his friends journey into the mysterious world of dinosaurs / All About Horses takes you right into the exciting world of horses in a live-action video designed for the budding rider future rodeo star or simply anybody who loves horses...

	Down in the Backpack Average Rating:

	Dora's Backpack Adventure [VHS] Average Rating:
	Good company makes any trip more enjoyable. In this animated double episode from the Dora the Explorer series, preschool viewers get better acquainted with little Dora's closest and most helpful travel companions: Backpack, Map, and Boots the monkey...