30L 40L Military. 30L 40L 50L Military. 12L 20L 30L 40L. 12L 20L 25L 30L. (If you don't need it, you can release / remove these three buckles, it is a simple schoolbag). 25L Capacity, High-intensity military-style specifications nylon, scratch-resistant, Not easy to fade.
eBay