Would love to review but, have not yet rec'd! Ordered end of February...still waiting!! More to follow! Slow and expensive shipping not yet worth it! $5 for shipping... 1 star

I normally do not like sports caps on my water bottles. After reading about this one I thought I would try it. The cap came before my new bottle did, so the service was fast. I did read somewhere to loosen the cap to get a better flow of water. This has worked for me- there is no leaking even with the cap loosened enough for the water to flow freely. Would tell others to purchase this product. 4 stars

This makes a lot of noise when I use it. It "squeaks" loudly. I'm not sure if this is because I put it in the dishwasher. I remember that it did not sound this way when I first received it in the mail. I'm thinking about ordering another but - I hate paying the shipping. 3 stars

The sport camp works great on our Kleen Kanteen 40oz bottles. It's much easy to use without having to take the loop cap off. The only down side is that there isn't a place to hook a carabiner. On the loop cap our bottles came with there was.
We hope that Kleen Kanteen could come up with a cap that has both functions. 3 stars

I recently gave up buying bottled water. While I don't miss dealing with all the plastic bottles, I did miss the sports cap that my favorite brand came with. I was happy to see that Klean Kanteen offers a sports cap, and I am happy that it works just like any other sports-capped bottle I've used.

Like other reviewers noted, my sports cap whistled when I took a drink. Thanks to another reviewer, I discovered that if I loosen the cap just a little, I get a much better flow of water and no whistling. Basically, my sports cap works best if I tighten it just to the point of stopping and then no more. (My habit is to use more pressure and tighten it that extra turn or so.) Even though I leave off that extra turn, I have had no problem with leaking. 5 stars