CamelBak HydroBak Hydration Pack Compact and sleek pack 1.5L (50 oz) OMEGA? HydroTanium橰eservoir Extra large opening for easy filling and cleaning HydroGuard?anti-microbial technology PureFlow?delivery tube Patented, proven Big Bite?Valve 90-degree Ergo HydroLock?shut-off valve Durable and leakproof with lifetime warranty Keeps water fresh with no plastic taste Easy access external reservoir fill External zip pocket for valuables Soft mesh shoulder harness straps Split mesh back panel for breathability Reflective strips on pack and straps for visibility Ideal for biking, mountain biking, light hiking Capacity: 50 oz (1.5 L) Dimensions: 13.6" x 8.5" x 1.8" (34.5 x 21.5 x 4.5 cm) Weight: Empty reservoir - 0.79 lbs (0.36kg) Filled reservoir - 4.1 lbs (1.86 kg) Color: Estate Blue / Charcoal