According to the difference of travel inclusion product, travel bags can be generally divided into three categories: large, medium and small.
With a capacity of more than 50 liters, the large travel bag is suitable for medium and long distance travel and more professional exploration activities. For example, when you are going to Tibet for a long journey or mountaineering expedition, you should undoubtedly choose a large travel bag with a volume of more than 50 liters. Some short and medium-term trips also require large travel bags if you need to camp in the wild, because only it can hold the tents, sleeping bags and sleeping mats you need for camping. Large travel bags can be divided into mountaineering bags and long-distance travel bags according to different purposes.
Climbing bag is generally thin and long, so as to pass through narrow terrain. The bag is divided into upper and lower layers, separated by a zipper interlayer in the middle, so it is very convenient to take and place items. The side and top of the bag can be tied with tents and mats, which increases the volume of the bag. Besides the travel bag, there is an ice pick set, which can be used for binding ice picks and snow sticks. The back structure of these bags is worth mentioning most. There is a light aluminum alloy inner frame supporting the bag body in the bag. The shape of the back is designed according to the principle of ergonomics. The belt is wide and thick. The shape adopts the "s" design that conforms to the physiological curve of the human body, and there is a chest belt that prevents the back belt from sliding to both sides, which makes the travelers feel very comfortable. And all these bags have a strong, thick and comfortable belt, and the height of the belt can be adjusted. The user can adjust the strap to a suitable height according to his own figure. Generally speaking, the bottom of the travel bag is above the hip, which can transfer more than half of the weight of the travel bag to the waist, thus greatly reducing the burden on the shoulder and reducing the shoulder damage caused by long-term load.
The bag structure of the long-distance travel bag is similar to that of the climbing bag, but the bag is wider, and is equipped with many side bags, so as to classify and place the fragmentary items. The front face of the long-distance travel bag can usually be opened completely, so it is very convenient to take and place the items.
The volume of medium-sized travel bags is generally between 30-50 liters. These travel bags are more widely used. For 2-4 days of field travel, city to city travel and some long-distance non camping self-help travel, medium-sized travel bags are perfect. Carry on clothes and some daily necessities can hold. The style and variety of medium-sized travel bags are more diverse. Some travel bags have added some side bags, which is more conducive to the separation of items. The back structure of these bags is roughly the same as that of large bags.
The volume of small travel bags is less than 30 liters. Most of these travel bags are usually used in cities. Of course, they are also suitable for 1-2 day outings.