1. Whether there is a double bottom fabric design, this feature can greatly extend the life of the backpack.
2. Is there a tow ring and a hanging ice axe ring?
3. Whether there is a flexible capacity design, long-distance travel is necessary.
4. 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.
5. Is there a design that is easy to carry crampons, sleds, snowshoes, and trekking poles?
6. Whether there is a removable side pocket, this feature can make the capacity of the backpack more flexible.
7. Whether there is a chest strap design, it can prevent the backpack from moving in difficult and bad terrain.
8. Whether the shape design is smooth, if the backpack is used for climbing or jungle, so as not to be entangled by branches or rocks.
9. Will the zipper be directly stressed? If it is directly stressed, what is its force limit? If the zipper fails, the backpack can still be used.