ALPS Mountaineering Reservoir 3.0 BPA- and PVC-free reservoir with anti-microbial IonPure treatment to help prevent bacteria and mold growth Revolutionary three-way articulating bite valve helps eliminates backwash and prevents air from entering tube Quick connect device allows drink tube to be disconnected from reservoir without leakage for easy refill / cleaning Dual cap  large opening for cleaning and smaller opening for filling Dimensions: 8" x 16", Weight: 8 oz., Capacity: 3L