According to the different backpack volume, backpacks can be divided into three categories: large, medium and small.
The Large Backpack area is more than 50 liters, which is suitable for medium and long distance travel and comparatively professional exploration activities.
Medium-sized backpacks are usually between 30 and 50 litres in volume. They are more widely used for 2 to 4 days of field trips, City trips and some long-distance non-camping self-service trips. Medium-sized backpacks are perfect.
Small backpacks have a volume of less than 30 liters. These backpacks are mostly used in cities. Of course, they are suitable for 1-2 days of outing.