This Outdoor Products Castaic Hydration Pack is ideal for camping, hiking, or trekking. It includes a BPA-free 2 liter hydration reservoir to keep you hydrated when you need it. It features a bite switch with on/off valve with a left or right hose port system so you can decide which side you want the hose. Carry this hydration pack comfortably with breathable mesh shoulder straps along with an adjustable sternum strap. This backpack is designed to be able to easily load the water bladder into to quickly get you on your way. The 2-Liter Bladder is included but it also fits the 3-Liter bladder (not included) from Outdoor Products if you need a larger capacity hydration bladder. This hydration backpack comes with a lifetime guarantee so you won't have to worry about using it.