This durable, BPA-free reservoir features:

Reversible design for easy filling and cleaning. The reservoir can even be removed and filled while leaving the hose threaded through the pack

Smooth inside for easy cleaning, and smoother outside to slip easily in and out of packs

Opening that automatically shuts off when the hose is removed

Fold-over and slide-closed top closure that never leaks and opens fully for cleaning and filling

100% TPU (no PVC) tube that drapes better over the shoulder while still providing strength and resistance to kinking

Removable press fit tube connection that makes cleaning easy

High-flow on/off bite valve.