45L LARGE CAPACITY: Capacity: 45L capacity, Size: approx. 11.8*19.7*8.7 Inches (W*H*D). The hiking backpack is enough for all articles when you are hiking camping trekking, such as book, camera, food, etc. It also has multiple compartments for hydration bladder HIGH-QUALITY MATERIAL: The military molle bag is made of oxford fabric material which is durable and water-resistant. And the teeth on the zipper is big and sturdy, thus it's not easy to get stuck when you need it COMFORTABLE: Mesh padded back and ventilated shoulder strap on the rucksack is breathable, anti-shock and sweat-resistant, suitable for long-time use MOLLE SYSTEM: Molle webbing is ideal for attaching additional tactical pouches or gears, The Military Tactical Assault Backpack also has the extra pockets needed for all the little odds and ends that one would bring during travel WIDE APPLICATIONS: This tactical assault pack backpack can be used as 3 day assault pack, bug out bag backpack, range bag, hunting backpack, survival backpack, army backpack, trekking backpack or day pack for daily use