LemonBest Functional Military Rucksacks Camping Hiking Backpack School Bookbag With Velcro area in front, D600 Nylon, High Abrasion Resistance, Highly Tear Resistant, Water-Resistant. Size: 43*25*15cm/ 16.9*9.8*5.9 inch; Capacity:20L, can put Ipad, A4 size books or magazines, and etc. Perfect size for a GoRuck challenge. Lots of loops for keys, pens and carabiner clips. Pockets all around good for holding water bottles. Headphone jack at the top of the bag, can make the wear from the hole conveniently headsets use. Convenient for shopping, hiking, mountaineering, Outdoor travel, field exploration, WARGAME, military enthusiasts collection and so on.