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1: Before choosing a backpack according to body length, you should pay attention to your body and trunk, because people of the same height may have different back lengths, so naturally you can't choose a backpack of the same size. So you should choose the right backpack according to your torso data. If the trunk length is less than 45cm, you can buy a small bag (45L). If the trunk length is between 45-52cm, you can choose a medium bag (50L-55L). If your torso is more than 52cm long, you can pick a big bag (more than 65L). Or take a simpler calculation method: the bottom of the backpack can't be lower than the hips. Note: although your trunk is suitable for carrying big bags, it can make the journey easier, and the smaller the backpack, the lighter the burden. 2. Choosing a backpack according to gender Because men and women have different body shapes and endurance, the choice of backpacks is not the same. Generally, men's practical backpacks over 65L are too big for women, which will cause a burden. In addition, the style and comfort of the backpack should also be tried in person before choosing. When looking up, avoid touching the frame or the top of the backpack. All parts of the backpack that touch the body should have enough cushions, and the inner frame and seams of the backpack should be strong. Pay special attention to the thickness and quality of shoulder straps, and check whether there are chest straps, belts, shoulder straps and their adjustment belts. 3. Load-bearing test When choosing a backpack, you must bear at least 9 kilograms to find a suitable backpack. In addition, there are backpacks that meet some conditions to meet the requirements. First of all, the belt should be placed on the hip bone, not the waist. Too low a belt position will affect the activities of the legs, and too high a belt position will cause a heavy burden on the shoulders. In addition, the belt should be completely placed on the hip bone, and it is not correct to only put the belt buckle in front of the belt on the hip bone. The shoulder strap should be completely attached to the curve of the shoulder without any gap. When the shoulder strap is tightened, the button of the shoulder strap should be located under the arm about the width of the palm. If the backpack can't cling to the body when the shoulder strap is completely tightened, it is recommended to change it to a shorter shoulder strap; If you stand in front of the mirror with your backpack on your back, you can see the buttons on your shoulder straps. This shoulder strap is too short. You should replace it with a longer shoulder strap or a bigger backpack. Tightening or loosening the "load adjustment belt" will change the shift of the center of gravity of the backpack. The correct way is to let the center of gravity lean forward to load the back, rather than let the center of gravity fall back to transfer the pressure to the waist. This can be achieved by adjusting the height and position of the "load adjustment belt"-tightening the belt will improve the position of the belt, and loosening the belt will reduce the position of the belt. The appropriate height of the shoulder strap is that the level of the starting point (near the top cover of the backpack) is roughly parallel to the earlobe and connected with the shoulder strap at a 45-degree angle.