Ok, but prefer the screw-on caps.
Does what it is supposed to.  I will say I have preferred the screw-on caps over the flip caps on these bottles.  (Get ready to groan)  When I flip the top on these a few drops are pulled out, lost.  I am sure these add up and for what appears to be an expensive form of water that is annoying to me.  Yes, I am Scottish.  A little more seriously, I find I am watching this as I open the bottle, since getting these drops on my fingers and then removing my lenses, well, that is like getting the solution in my eyes, not recommended, and definitely not fun.
Rating: 4 stars