The adjustment range of the shoulder strap must match the length of the back to bring the center of gravity to the desired position; the hip belt must be able to be tied to the tibia. When you carry your backpack, you should be able to see your hips and legs from the back. Women who are more petite should pay special attention to this. You can only see the backpack and calf from the back when you are carrying your backpack. This is very wrong and dangerous.
Before purchasing a backpack, you should loosen all the adjustment belts and add weight, because if you don't have weight, you can't know the feeling of the backpack and the adjustment range. If you carry the backpack, you should check the curvature of the built-in aluminum strip and the curve of the back. Whether it is consistent, if it is not, check whether the aluminum strip is bendable; if it is bendable, the aluminum strip will naturally bend into a curve matching the back if it is used for a while. The shoulder strap and backpack connection must be 5-8 cm below the shoulder, and the gap between the shoulder strap and the backpack should be small. The chest strap adjusts the width of the shoulder strap at the chest and allows the shoulder strap to be more comfortable on the shoulder and prevents the backpack from shaking. Good at using these adjustment straps and filling techniques, you can adjust the weight between the shoulders and the hips so that different muscle parts can share the weight.
After adjusting the backpack to the most suitable position, should you check the line of sight of the head? Can you look up and not touch the top of the backpack? Can I still look up to the sky when I put on my helmet? Is the backpack and back contact part comfortable and breathable? Special attention should also be paid to the width and quality of the shoulder strap and hip belt.
In addition, there are some details to note:
Whether there is a double-layered fabric design, this feature can greatly extend the life of the backpack.
Is there a tow ring and a hanging ice axe ring? The multi-day long-distance 跋 involves the design of the backpack with elastic capacity when walking.
Whether there is a design of the compression side belt, when the equipment is reduced, it can tighten the backpack to reduce the capacity of the backpack, so as to prevent the displacement of the equipment in the backpack from affecting the balance of travel during the action.
Is it convenient to carry crampons, sleds, snowshoes, and trekking poles?
Whether there is a removable side pocket, this feature can make the capacity of the backpack more flexible.
Whether the backpack has a chest strap design can prevent the backpack from moving in difficult and bad terrain.
If the backpack is used for climbing or in the jungle, you should choose a backpack with a smooth shape to avoid being entangled by branches or rocks.
The material of the backpack fabric should be strong and wear-resistant, which can meet the needs of field activities.
Will the zipper of the backpack be directly stressed? If it is directly stressed, what is its force limit? If the zipper fails, the backpack can still be used.