The only way to improve this cap is to decrease the price. It works perfectly, is easy to use, and is much more convenient than the screw lid. Would be cool if these came in the color options to match the bottle.

It's a bit pricey, but I'm very glad I got it. Makes it much easier to drink from the bottle, especially on the go, and much more leak-proof than the straw version (which I also have). Highly recommend.

I initially wanted the straw and regular cap. But opted for the flip cap via the recommendation of my mom. Also, the color I wanted was sold out. I’m happy with the flip cap because it does not leak and my 1 year old is obsessed with my bottle and drinks best from this type of cap. Wonderful for travel and I like finger hoop to carry my bottle.