The correct method of backing a backpack is as follows: 1. Hold the adjustable strap under the shoulder strap lock of the backpack with both hands. 2. Pull the adjustable strap back and down forcefully 3. Pull the adjustable strap to the bottom of the backpack. 4. Close up to the root, the standard normative action of the backpack has been completed. This is the correct backpack. You must pull the adjustment straps to the end, the shoulder straps are close to the shoulder joints, the backpack is close to the spine, and the bottom of the backpack falls above the belt. In this way, the back is naturally straightened, the head and neck naturally return to the neutral position, the head and neck do not need to be stretched forward to maintain the balance of the human body, the pain in the neck and shoulders naturally disappears, and the bottom of the backpack falls on the belt. Above, the weight of the backpack can pass through the sacroiliac joints, and then through the thighs and calves to the ground, sharing part of the weight.