According to the backpack volume is not the same, the general can be divided into three categories of large and small backpack.
Large backpack volume of 50 liters or more, for long distance travel and contrast professional adventure activities. For example, when you want to go to Tibet such a long-distance tour or mountain adventure, you will undoubtedly choose the volume of 50 liters or more large backpack. Some short-term excursions If demand is needed in outdoor camping, also need a large backpack, since only it can hold the camps you need for sleeping bags, sleeping bags and sleeping mats. Large backpack based on the use of different can be divided into climbing bags and long-distance tour with a backpack.
Mountain climbing bags generally thin body, so that after a narrow terrain, the body is divided into two layers, the center with a zipper sandwich separated, so that when the items are very convenient. Backpack on the side and the top can be bundled with the mat and mat, virtually increase the volume of the backpack. There are ice horns outside the backpack, for binding ice picks, snow pole with. The most worth mentioning is the back of these backpack structure, the package has a package of lightweight aluminum alloy frame, the shape of the back is ergonomic principles of planning, back and wide and thick, shape selection of human physiological curve "S" type of planning, and also to avoid the strap to the two side of the chest strap, so that the backpackers are very comfortable. And this kind of backpack all have a strong, generous and comfortable belt, the height of the strap is able to conditioning. The user can be based on their own posture is very convenient to adjust the belt to the appropriate height. Generally speaking, the bottom of the backpack is located above the buttocks, which can be more than half of the backpack weight transferred to the waist, and then greatly reduce the burden on the shoulder, reducing the burden of long-term weight loss caused by the shoulder.
Long-distance tour backpack package body structure and climbing package similar to the body only large, and with a lot of side bags, so that trivial objects will be classified, long-distance tour backpack front face can be fully open, pick and place items is very convenient.
Medium backpack volume is generally between 30 to 50 liters, the use of these backpack more extensive, 2 to 4 days of outdoor excursions, tour between the city and some long-distance non-camping self-help tour, medium-sized backpack is appropriate The. Carry the clothes and some ordinary supplies can be loaded under the next. Medium-sized backpack style and type of more diverse. Some backpacks add some side pockets, which are more conducive to sub-items. The backpack of these backpack and large backpack roughly the same.
Small backpack in the volume of 30 liters, these backpacks are generally used in the city, of course, for 1 to 2 days of the picnic is also very appropriate.
There are also some special use of backpacks, such as bicycle bags and backpacks. Bicycle bag is designed for cycling and planning, divided into the former package and after the package, the former package is small, can be hung on the front beam of the bike, put some easy access to the items, Big, usually a pair, do not hang on both sides of the back of the bike, full of heavy and heavy items. Backpack is commonly used when climbing, the back frame is made of lightweight aluminum alloy ladder metal frame, used to transport larger items, such as boxes and so on. Backpack package is based on the basis of planning, that is, in the backpack plus a removable metal frame, this type of package is more suitable for heavy objects when used.