Now completely redesigned, the Hydraulics 1.5 liter waist pack features innovative and ergonomic improvements that make it easier to carry, fill, store and use - whether you're roaming around town, on the road or hitting the trail. This hydro bag is specially made for kidney packs and hip bags designed for it. BPA free. The ergonomic handle allows one-handed filling and makes carrying and pouring easier. The compact mouthpiece ensures perfect water flow. The thumb-operated on/off lever on the mouthpiece is now easier to operate with one hand than ever before. The Slide-Seal's compact opening facilitates one-handed filling, reduces unnecessary volume, slides more easily onto packages and seals perfectly. Seamless compatibility with the new HydraClip hydrobag hinge (for safe carrying in backpacks). Hose with extremely safe magnetic system. Double baffles flatten the profile of the hydro bag and improve handling during its filling, carrying and pouring.