According to the different volume of the backpack, the backpack can generally be divided into three categories, large and small With a large backpack volume of more than 50 liters, it is suitable for medium and long distance travel and more professional adventure activities.
For example, when you're going to a region like Tibet, When traveling or hiking adventures, you should no doubt choose a large backpack with a volume of more than 50 liters. Some short-and medium-term trips also require a large backpack if you need to camp in the wild, as only it can hold the tents, sleeping bags and sleeping mats you need to camp.
Large backpacks can be divided into mountaineering bags and long-distance travel backpacks depending on their use. Mountaineering bags are generally slender in order to pass through the narrow terrain, the package is divided into the upper and lower two layers, the middle with a zipper interlayer separated, so that in the pickup items are very convenient. The side and top of the backpack can be tied with tents and mats, invisibly increasing the volume of the backpack. There is also a ice pickaxes sleeve outside the backpack, which can be used for bundling ice pickaxes and snow sticks. Most noteworthy is the back structure of these backpacks, the bag has a support package of lightweight aluminum alloy inner frame, the shape of the back is designed according to ergonomic principles, back bandwidth and thick, the shape of the body in line with the human physiological curve of the "S" design, and also to prevent the strap to the side of the sideslip chest strap, so that backpackers feel very comfortable And all of these backpacks have a sturdy, generous and comfortable belt, and the height of the strap can be adjusted. Users can easily adjust the strap to suit their height according to their size.
Usually the bottom of the backpack is above the hip, which shifts more than half of the backpack's weight to the waist, greatly reducing the burden on the shoulders and reducing shoulder damage due to long-term weight loss.
The package structure of the long-distance travel backpack is similar to that of the mountaineering bag, except that the package is large and equipped with many side bags in order to classify the bits and pieces, the front face of the long-distance travel backpack can usually be fully opened, and it is very convenient to take the items. The volume of medium-sized backpacks is generally between 30~50 liters, these backpacks are more widely used, 2-4 days of field travel, city travel and some long-distance non-camping self-service travel, medium-sized backpacks can not be more appropriate. The clothes and some everyday items you carry with you can be loaded. Medium-sized backpacks are more varied in style and variety. Some backpacks have added some side bags, which are more conducive to the distribution of items.
The back structure of these backpacks is roughly the same as that of large backpacks. Small backpacks have a volume of less than 30 liters, and most of these backpacks are generally used in cities, and of course they are ideal for 1-2 days of outings.