The 15L Bullet is a grab and go daypack. One day it&';s a trip to the pool, the next you&';re stuffing jackets and snacks into your backpack for a day hike. This one is built with a fabric originally made for high-performance sailing. The Bullet Ruck thrives on short trips away from home, when you&';re traveling light and fast. Now with X-PAC and AquaGuard zippers, your gear will be locked down and ready-monsoons, dust storms, sand, mud-whatever the hell the road (or jungle) throws at you. Features Opens flat, making it easier to pack and organize Streamlined Design with only a single compartment and 3 interior pockets Hydration bladder clips into the interior d-ring with a carabiner and feeds the hose through the exit port under the top handle of the backpack YKK AquaGuard zippers to keep out rain, dirt, and sand Weatherproof: X-PAC VX21 is our most waterproof material, paired with some of the best zippers on the market Specs + Materials Primary Material: X-PAC VX21 (All colors except Multicam) Multicam Primary Material: X-PAC X33 Interior Material: 400D Pack Cloth Dimensions: 10.75"W x 18.5"H x 5.5"D Weight: 1.3lbs External Slant Pocket: 10.5"W x 11.5"H Internal Mesh Pocket: 10.5"W x 11"H Internal Cordura Pocket: 10"W x 6.75"H