Good product, but I don't use it
I don't want to talk bad about the product because it does what it claims to do and does it well. My only thing is that the places I have been, I could use a bandana instead which is lighter and I carry anyway. Dual purpose gear is great when you are trying to go light. With this, it just takes up space and weight I wouldn't otherwise need. That being said, if I go someplace and I am unfamiliar with the water quality, I would probably throw this in my bag.