During camping, the backpack must be closed to prevent small animals such as rats from stealing food. At night, the backpack must be used to cover the backpack. Even in sunny weather, dew will still wet the backpack. During the snow season, backpacks can be used as the door of the snow cave.
If crawling in the woods or shrubs, it is more suitable to lower the center of gravity of the backpack. The camping can put an empty backpack under the feet and put it outside the sleeping bag. Clean your backpack.