Secure SlideLock™: Slides both directions to easily open, securely close and fill reservoir.Handy Pincher Grip: Allows for easy one-handed filling.High Mount Quick-disconnect: Offers fast, easy access—no more digging down in your pack.Leak-proof Shut-off Valve: Instantly stops flow and offers reliable stowing.Semi-rigid Center Baffle: Offers low-profile support and makes for easy cleaning and drying.HyFLO™ Self-sealing Bite Valve: Improves flow along with new, larger 5/16" drink tube.Funk-free: Embedded Silver-ion protects clean water from mold & bacteria.Pure Platy Experience: All materials are certified taste-free, BPA-free, BPS-free, and phthalate-free.