Couldn't wait to get my hands on one, and it worked just as expected. No longer do I have to wrap my bite valve in plastic or do other efforts to keep in clean while hiking, , hunting, working or traveling. Bought 3 and will always have an extra on hand.

It keeps the dirt and debris from sticking to your bite valve. I thought this would be a breeze to install but I had to jack with it for a few minutes.

Doesn't do much to contain leakage, you need a shut-off valve for that.

Aw, crap, this is must-have for me on the trail. In the dark early days before bite-valve covers, I was sucking on dirt.

It works exactly like it is supposed to. As far as it being a little difficult to install think about it this way. The easier it is to get on, the easier it is to come off when you don't want it to. To get it on heat up the end of the bite valve in really hot water and put the hydrolock in the freezer. That will make it fit on there a little easier. Also instead of trying to twist the bite valve on you can use the cover to pull it down. Just get the valve started then bring the cover (while open) as far up as you can. Squeeze the bottom of the cover around the valve and pull down.

I bought the hydrolock as a right-angle device, not so much as a lock. The valve cover keeps out dirt. Works great together.

It is a bit valve cover... It doesn't do much. Yet what is does is an invaluable service. It keeps crap off this thing you are constantly sticking in your mouth.

I hate getting dirt and crap on my mouthpiece when I put my pack down, so I decided to get this. I don't know if the cover I have fit properly or not, but water still leaks from it from time to time. Its as if the cover is just snug on the mouthpiece to the point that it puts enough pressure on the bite valve to open a little. I don't know. Like I said it does the job still..

Does exactly what I want it to, protects my bite valve from getting dust, sand, mud, or whatever else you mind run into in the backcountry. It was a little difficult getting on, but I would assume that's a good thing since you don't want it to be able to fall off with your bite value. I recommend it for your CamelBak.

Personally, this is a must-have. Whether it's sand, mud or otherwise, I don't want anything except water to come out of my bite valve, and this solves that problem.

must have, it keeps the mouth piece clean.

This thing is awesome and protects my bite valve from dirt and whatnot. However, it was pretty difficult to actually put on as the end covers the bite valve, making it hard to pull the valve on to the drinking tube. After some maneuvering I got it, but I'm sure there's a better way to design this product so it's easier to install.

I thought this was stupid until I started paying attention to all the places my tube end was ending up. Dirt... ground... mud... outhouse. Yuk- that did it. I love the camelbak's easy access to drinking when I'm biking... but for hiking, camping, and backpacking- I'd recommend adding the cover.

I use this cover all the time while canyoneering because I'm usually swimming through yucky stagnant water or sliding between canyon walls. Then when I get thirsty I have a clean bite valve!

My previous big bite mouthpiece cover (BBMC) wore out so I ordered this new one. It wasn't the same so I sent it back. You sent another so I presumed the design had changed. It fits the large mouthpiece so tightly that it creates a leak so the water drips as I walk. I can only use it to cover the mouthpiece when I lean over or take the backpack off, or else it drips slowly on my leg. It is really terrible. Does Camelbak now only make one size mouthpiece cover?