Water stored in hydration carriers can heat up quickly under the withering heat of the summer sun. The USGI version of CamelBak's ThermoBak keeps liquids cooler longer with closed cell insulation and a neoprene tube cover. The Desert Digital Camouflage (Patterns and colors vary) cover is made from 1000 Denier Cordura fabric to protect the insulation and D-ring attachment points allow the user to mount the carrier to a pack or load bearing vest. The Two Liter capacity hydration bladder utilizes CamelBak's HydroLink modular connectors and the Hydrolock positive shut-off.