Review on Replace Your Nalgene On The Fly Water Bottle Cap With BPA-Free Option by Brian Finley

I really want to like this top and I can't seem to find any others so I'm sticking with it. I love how it spring-pops open so I can open it with one hand. No leaking at all even when upside down (as long as you close it all the way). This top lasted me 2 years before the little tab broke (see pic) and even after that, when the silver hook is in place, it doesn't leak.Biggest thing is this mildew stain that never goes away. I don't think it changes the water quality in any way but its a mental thing. Why would you drink out of something that looks dirty (even if its not)? Theres no way to clean off this stain once it sets in so unless Nalgene creates a new kind of stainless silicone, then we're stuck with this.