The CamelBak HydroBak MG is a lightweight, low-profile hydration pack designed for portability. Its ergonomic shoulder and sternum straps make it easy to carry and include comfortable mesh padding, and the shape of the harness prevents it from interfering with a helmet. The Diamond Clarus and nylon exterior features a water-resistant polyurethane coating for all-weather use. Inside, closed-cell insulation cushions the reservoir and maintains its temperature. The 1.5L (50 ounce) reservoir is made from ultra-durable Water Beast polyurethane. Its insulated PureFlow tube preserves water freshness, and ends in a silicone Bite Bite Valve for convenient, spill-free access. HydroLock flow controls allow you to shut off the water at will. The reservoir’s large Omega opening makes it quick to refill and screws down tight to prevent leakage.