Aerodynamically streamlined, the Vector molds to the contours of your back. Designed to increase performance in cramped quarters such as aircrafts, tanks, vans, and helicopters. The Vector has the integrated suspension harness to lower your profile when worn under jackets, vests, packs, or web gear. Internal reservoir holds 100 oz. of water in the HydraStorm baffle design. Made of 1000D NyTaneon with full YKK zipper, flame laminated to moisture wicking mesh. Integrated tube routing system and suspension harness. Fully insulated carrier for hours of hot or cold water.