With its 2-in-1 design, the CamelBak Arete 18 50 oz. Hydration Pack is the perfect pack for those trail adventures, mountainous jaunts and everything in between! The Arete holds 50 ounces of water and offers storage for extra gear and food. This hydration pack converts into a reservoir sleeve for storage in a larger bag. The Antidote Reservoir offers simple sipping and refill throughout your journey! FEATURES: Great for mountain biking, trails and day long adventures Ideal for carrying gear, snacks, apparel and more Frameless construction Bag capacity: 16.5L Hydration capacity: 50 oz. CRUX reservoir with standard exit port Wide mouth lid snaps on and off with a quarter turn for easy filling and emptying HydroGuard technology prevents the growth of bacteria PureFlow tube for free flow of liquids Big Bite Valve simplifies drinking, and safely seals shut after each sip Lightweight for easy carry 2-in-1 reversible design converts bag into a reservoir sleeve Dual side mesh pockets for storage Removable sternum strap 100% BPA and BPS free Simple to clean and maintain Manufacturers Camelbak Got Your Bak lifetime guarantee SPECS: Total Capacity: 16.5L bag + 1.5L reservoir Hydration capacity: 1.5L/50 oz. Weight: 1 lb., 10 oz. Torso Length: 13 Back Panel: 70D Nylon Harness: Air mesh Fabric: 240D box ripstop nylon Dimensions: 15.9 x 9.1 x 9.1.