According to the volume of the backpack, the backpack can generally be divided into three categories: large, medium and small
The large backpack has a volume of more than 50 liters, which is suitable for medium and long-distance travel and more professional adventure activities. For example, when you are going to a region like Tibet for a long-distance trip or mountain expedition, you should undoubtedly choose a large backpack with a volume of more than 50 liters. Some short- and medium-term trips also need a large backpack if you need to camp in the wild, because only it can hold the tents, sleeping bags and sleeping pads you need for camping.
Large backpacks can be divided into mountaineering bags and long-distance travel backpacks according to different purposes.
Mountaineering bags are generally thin and long to pass through narrow terrain. The bag is divided into upper and lower layers, separated by a zipper sandwich in the middle, so that it is very convenient to pick and place items. The sides and top of the backpack can be tied with tents and cushions, which virtually increases the volume of the backpack. There is also an ice axe cover outside the backpack, which can be used to bundle ice axes and snow poles. The most worth mentioning is the back structure of these backpacks. There is a lightweight aluminum alloy inner frame that supports the body of the bag. The shape of the back is designed according to ergonomic principles. The back is wide and thick, and the shape is in line with the physiological curve of the human body. The "S" shape design and chest straps to prevent the straps from sliding on both sides make the backpack very comfortable. Moreover, these backpacks all have a strong, wide and comfortable waist belt, the height of the strap can be adjusted. The user can easily adjust the strap to a height suitable for him according to his body. Generally speaking, the bottom of the backpack is above the hips, so that more than half of the weight of the backpack can be transferred to the waist, thereby greatly reducing the burden on the shoulders and reducing the damage to the shoulders caused by long-term weight-bearing.
The body structure of a long-distance travel backpack is similar to that of a mountaineering bag, except that the body is larger and is equipped with many side pockets to classify and place the odds and ends. The front face of the long-distance travel backpack can usually be fully opened, making it very convenient to take and place items.
The volume of a medium-sized backpack is generally between 30 and 50 liters. These backpacks are more versatile. For 2-4 days of field trips, travel between cities and some long-distance non-camping self-service trips, medium-sized backpacks are more suitable. Up. The clothes you bring with you and some daily necessities can be fitted. The styles and types of medium-sized backpacks are more diverse. Some backpacks have added side pockets to make it easier to pack items. The back structure of these backpacks is roughly the same as that of large backpacks.
The volume of small backpacks is less than 30 liters. These backpacks are generally used in cities. Of course, they are also very suitable for outings of 1 to 2 days.
