Mosiso 50L Tactical Backpack, Large Men 3 Day Assault Rucksack Military Daypack Made of polyester material, metal zippers and reinforcement edge bottom with side load compression system, can be used in wild environment. Dimension: 21.7 x 12.6 x 11.2 inch / L x W x H. 2 main large compartments with multifunctional pockets for different stuff: sleeping bag, pillow, clothes, climbing rope, notebook, water, cell phone, key, flashlight and other sundries. The bigger one has 1 hydration bladder pocket and 2 mesh pockets, large enough to store laptop (up to 17.3 inch). 1 hidden zipper anti-theft pocket on the back for your precious stuff and 1 hidden pocket for alpenstock. Webbing throughout whole bag can attach additional pouch or outdoor gear. Can be used as large tactical military backpack for 3 day assault pack, combat backpack, camo backpack, survival backpack, military army rucksack, everyday carring bag, emergency backpack, bug out bag backpack, range bag, survival backpack, army backpack, hunting backpack, hiking backpack, camping backpack, trekking backpack, rucking backpack, rucksack or travel backpack for outdoor, sports, hiking, hunting, fishing, camping, training. With removable USA flag patch in front. Made of polyester, metal zippers and reinforcement edge bottom with side load compression system, can be used in wild environment. Breathable mesh back panel and shoulder strap (adjusted from 15.35-34.65 inch) is designed to ventilate, keep your back dry. Meanwhile 1 horizontal strap surrounding your waist to firm our large tactical backpack on your back.