Hydrapak Elite Velocity Hydration Reservoir 50oz. 1.5 Lite is 100% BPA & PVC free. Slide-Seal top opens wide for easy filling & seals tight. High-flow Blaster bite-valve with twist shut-off. Plug-N-Play Connector quick disconnect for convenient tube removal. Can be frozen or filled with hot water. Inline filtration compatible. Reversible for easy cleaning & drying. 'Beyond' Lifetime Guarantee.