This is an RNX 3 liter leak proof water bladder that is designed from military grade PEVA material by Rugged Nation. It has a 3 liter water reservoir that keeps your water cool for up to 3 hours. This water bladder design is made to fit most Hydration backpacks and has two reinforced attachment areas at the top to attach to your backpack. The easy to use mouth piece has a cover, pulls to open and has a rubber tip you squeeze with your teeth to allow the water to flow. The water straw is insulated to keep your water cool for as long as possible and is 39 inches long enabeling it to route through any hydration backpack. This water reservoir is ready to prove its place in your hydration pack and is suitable for all your back packing, hiking, camping, climbing, fishing, running, biking, travel or other outdoor activities. No matter what you're doing it ensures you will be prepared for your next adventure!