Killik H2O 3 Liter Hydration Pack - Lightweight streamlined pack for shorter trips when hydration is critical. Features: a Lightweight, super-strong, water-resistant polyester fabric a YKK zippers with easy-grab pullers a Quality Duraflex hardware and buckles a Nylon webbing straps a Reinforced seams and stress points a Padded jersey-lined backpanel a Lightweight low-profile shoulder straps with adjustable chest strap a Built-in safety whistle buckle in chest strap a Removeable, adjustable webbing waist belt a Compressible front "stuff it" pocket for quick access to external gear a Fleece lined front zippered pocket a 9+ Pockets! a 3L / 100 oz Hydrapak hydration bladder included