The CamelBak Crux Hydration Pack Replacement Reservoir Bladder in Blue is a durable and reliable hydration solution for outdoor activities like cycling and hiking. With a size of 1.5L, this leakproof reservoir bladder is made of polyurethane material and is BPA/BPS/BPF free. With the CamelBak brand known for quality and performance, this replacement bladder is a great choice for staying hydrated on the go.