"Keeps the dust, mud, and everything else away from the bite valve!"
After using this bite valve cover with my Platypus hydration bladder, I'll never go without it again! It does a great job of keeping everything off your bite valve, and stays flexible and easy to open/close even while cross-country skiing for a few hours in 10 degree Fahrenheit weather. The cover has never come open accidentally, and opens fully enough for easy cleaning.
We bought a Platypus bladder specifically because we could get a bite valve cover for it. This is perfect for keeping the bite valve clean. Now we can just set our packs on the ground and not have to worry about getting dirt in our mouth the next time we want to drink out of the water bladder. It stays on well and performs as described. We also like that their products are made in the USA.
Does a great job, I have no problem opening it with one hand, I just wish platypus would include this with their systems from the start, I cant think of a time you wouldn't need this theres dirt and dust everywhere why would you want something going in your mouth exposed to that?
When I take my pack off for breaks, I assume like most I just dump my bag at the base of a tree. Using a hydration kit in my bag I was afraid of the mouthpiece getting contaminated with dirt, leaves, and other junk. With this device, there's no problem. It installs in just a few seconds and keeps the bite valve contamination free. The big tab on the cover makes it easy enough pull it off with your teeth when you need a drink, letting you use your hand but of course, that somewhat defeats the purpose of the valve.
"Needs to be improved so it works with one hand"
It covers the bite valve, if you have a new one. The older bite valves are too tall for this cover. But it takes 2 hands to open and close it, and it is hard to close. It does keep the bite valve from being accidentally pressed open, like when you lay your pack down on top of the valve.