TRU Zip Waterproof Zipper: Durable, leakproof closure for secure hydration on the goSingle-Handed Filling: Integrated handle and pinch grip make refills quick and easyUniversal Pack Compatibility: Hangs securely in any hydration-compatible backpackRigid Backplate Design: Maintains shape and simplifies cleaning—no baffle requiredHigh-Flow Hydration: Big Bite Valve delivers 20 percent more water per sip with leak control