Aircee (TM) 40L Outdoor Gear Assault 3P Backpack Small Tactical Molle TAD Backpack Waterproof Travel Daypack Military Rucksacks Made of 600D nylon, is durable and waterproof. Heavy duty adjustable padded shoulder straps,Breathable mesh backing provides a comfortable feel in hotter weather. Three exterior zippered compartments. Huge expandable main compartment with interior enclosure for small gear,Medium and small compartments for smaller gear. Side and Top Flap cinched down gear security straps MOLLE external expansion system designed to be used in combination with other equipment, you can load pockets, water bottle bag, accessory kits and other Size about :45X21X28cm,capability about 40L~45L.