ArcEnCiel Tactical Outdoor Hydration Water Backpack Bag with Patch Material: 1000 Denier Nylon for daily durable use Structure: 3 zippered front, 1 zippered main, 1 zippered hydration rear pocket: accepts up to 3L water bladder, wide padded adjustable shoulder strap with metal accessory hook & large buckle snap Molle Straps, D rings, attachment points: allows excellent attachment of pouches, accessories, caribiners, etc... when needed Large bottle holder with locking drawstring to secure it, accepts bottles up to 4" Diameter; X-LOCK bungee system designed on the cover for you to fasten umbrella, tripod, water bottle and so on. Features ergonomic suspension system which can ensure the perspiration performance