A cloth sack carried on your back and held over the shoulders is called a backpack. A backpack is used to carry loads that are too heavy for hands to carry for a long time. There is the one strap backpack that can be hung over a shoulder. This is to carry lighter loads. The heavier loads are carried in the larger backpack with two shoulder straps. Hip belts are provided in some backpacks to transfer load to the hips. This is helpful when the weight of the load is over 22 lbs. The hips have a better capacity to withstand load more than the shoulders.
Younger generation, particularly the students, fancy backpacks and use them extensively. They use the backpacks to carry their books. Most often the backpacks come to be called as schoolbags or bookbags. The various compartments and pockets are used to carry things they need. Backpacks have become part of the gear that soldiers have in many countries. Equipments weighing even 100 lbs are hauled by them. Additional pockets and compartments with padding are used to carry delicate items such as laptop, cameras and cables. These may be either on the inside or outside. Backpacks with wheels are also available. They come in handy when heavy loads are to be carried over even ground such as smooth pavements, platforms in rail stations or airports. These backpacks have wheels at the bottom and an extendable handle for holding and dragging at the top. The strain on your shoulders can be avoided with these backpacks.
There are three types of backpacks. The frameless backpacks are the most popular and are also the cheapest. The external frame backpacks are for carrying heavy loads. But they are stiff because of the frame. The backpack with internal frame is more flexible and gives you free movement. You can use this to carry moderate to not so heavy load. The Osprey Argon 70 Pack is a backpack with internal frame which are available in five torso sizes. It has a compartment to carry sleeping bag. The harness and combos are moreover gender specific.
Backpacks have become increasingly popular. This is especially so amongst leisure travelers particularly when they are on to some country or nature trekking. Urban use too has increased. It is their compactness and the free mobility that it provides the backpacker that makes backpacks so attractive.
When a person travels, he or she has to bring very important things. Thus, an Osprey Argon 70 should be used for packing them.