Mazama Dual Hydration Bladder, Replacement Reservoir for Most Backpacks, Carry Water and Electrolytes DUAL CHAMBERS: Carry both electrolytes and water so you stay energized and cramp-free. Left and right drink tubes let you access electrolytes or water on demand. TASTE THE WATER: Taste-free, USA-made bladder film. Taste your water, not plastic. No PVC or BPA. WIDE MOUTH BLADDER OPENING: Opens wide for fill-up and clean-up and features a lock and go leak-free closure that positively seals every time. Integrated quick connect exit ports allow for easy removal of reservoir from pack. A BETTER BITE VALVE: Includes our proprietary high-flow bite valve with a one-hand push button shut off. Super magnets on the bite valve and magnet retainers ensure easy fluid access on the go UPGRADE YOUR HYDRATION PACK: Includes premium features and is a great choice as your go-to reservoir. The Dualocity fits most 3 Liter (100 oz) fluid capacity hydration packs (Check that your packs bladder compartment length is at least 17 inches).