5 L pack, 1.5 L reservoir Cold Flow™ System keeps water cold 3+ hours HydraPak® IsoBound™ 1.5 L Insulated Reservoir High-flow HydraPak® Blaster Bite Valve self-seals after each sip HydraPak® Plug-N-Play™ connect system for convenient refilling Dual stretch bottle pockets fit 12 oz–24 oz Standard and Wide Mouth Bottles Adjustable compression straps Two zippered hip belt pockets Internal organization for tools, snacks, keys and other essentials Soft-lined media and sunglasses pocket