DON'T DO IT! Some people advise using rubbing alcohol to lubricate the mouthpiece and help with adjustment. Not only is this unnecessary, it can also shorten the life of your mouthpiece. Rubbing alcohol degrades plastic/rubber over time, leading to loss of elasticity and cracking. STOP REPORTING THIS GUYS. With that said, I will now give my review: A SANITARY water system is SO important for backpacking because of the consequences dirty/unsanitary drinking can have. It doesn't take long to throw your backpack in the same spot where an animal peed that same morning. So many things can happen, and depending on the situation, drinking unclean water can be deadly. For backpackers, this valve cover is a must and should be standard on all backpack bladder systems. I keep one of these on each of my bags and kids' bags, which allows me to better focus on my surroundings and the outdoors instead of worrying about my mouthpieces or those of my kids. It's easy to get your mouthpiece dirty and this little addition makes hiking so much better and less jittery.
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