Trekking tourist backpacks. Their volume is 35-70 liters. The back is rigid and can be adjusted to suit the person's height. They are suitable for mountain hikes and have comfortable compartments inside and loop for sticks. Trekking means moving through the mountains, hence the name of the backpack.
Ordinary sports backpacks have a capacity of 30-50 liters. Perfect for ordinary walks in the forest, they are smaller in size than tourist ones, although they are similar to them. Used for sportswear, footwear. There are special mounts for all sorts of equipment, pockets, a place for water transfer. https://denimgrace.com/what-beach-bag-you-have-to-choose-in-2020/Assault backpacks are not suitable for hiking, as are sports ones. They are used for mountain climbing in order to carry equipment and food. The main part of things, as a rule, remains at the camp site. If you wish, you can go hiking with such a backpack.