Unlike any other hydration system on the market, Geigerrigs Hydration Pack Engine G2 has a pressurized tube capable of spraying water with a pinch of the quick-release valve. Spray it to cool down, clean up or share a drink. Just give the easy-access power bulb a few quick pumps and spray away. Its easy to drink and just as easy to clean. The BPA- and Pthalate-free hydration engine reversible reservoir has a leak-free slide top with a wide mouth for easy refilling and is dishwasher safe. Remove the drinking tube for cleaning using the quick-release valves. Hook the tube up to an optional in-line filter (sold separately) for instant conversion to clean drinking water. Nylon fabric backing adds a layer of protection when nestled against other items in your pack. Sizes: 70 oz. (2 liters), 100 oz. (3 liters). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Hydration Packs.