Innovative hydration reservoir that maintains its shape, ideal for large volume packs and long duration activities.Hydrostatic Backerplate provides structure to reservoir allowing it to easily be shoved into a loaded pack and provides a flat profileEasy slide top opening seals watertight and provides wide access for filling and cleaningPour Shield extends the collar to ease filling in shallow sinksCarry handleMagnetic bit valveHydrapak blaster bit valve offers fast, smooth water flow with 1/4 twist on/offQuick connect system allows for easy removal of reservoir