In other words, people have a heavy load when climbing mountains, so they need to be compact to climb mountains, but when you put so many things in such a small space, you must cover the ground when you take them out. The mountaineering bag is a little loose because the environment is much better.
The overhead bag mentioned above, nothing is put overnight. It is very small. The punching bag is stuffed in the mountaineering bag.
The light mountaineering bag is relatively small, and it is used for routes within 12 hours, and there is no tent sleeping bag inside. In fact, it is enough to use students' backpacks on foot.
Actually, it's a bag anyway. You must first understand that the capacity of your bag is the most important. I bought Lafuma45L mountaineering bag, which is practical and can be installed well for your reference.