This 1.5 liter hydration Reservoir is PVC and BPA free. The Hydrapack Elite 1.5l Reservoir was specifically designed to fit into and work with Kokatat's Tactic Pack, and Tributary rear pocket. The clip on the top of the Reservoir slides off for easy filling and cleaning. The quick disconnect hose fitting makes it easy to get the Reservoir in and out of the sleeve without having to remove the whole system. Check-valves in the disconnect prevent water from spilling while doing installing.