We've taken one of our best sellers and made it even better! Updated to accommodate the Source 3L Bladder, sold separately, (will fit any similarly sized bladder such as Camelbak 3L Omega, Nalgene 3L, Platypus, etc.) as well as improved shoulder strap interface with bulky equipment and body armour. Insulated with close cell foam to ensure that your water will keep cool or help prevent freezing in a range of temperature extremes. Heavy-duty #10 zipper provides easy access to refill or clean the hydration bladder. External MOLLE/PALS webbing allows for any modular pouches to be attached. Constructed of Cordura nylon, mil-spec webbing and hardware. Backed by 5-year warranty.