Bests & Worsts Reviews from Amazon

Liked the ease of use and durability. Does keep water cold in a hot car. Ease of cleaning? Forget it! After following instructions on how to clean, was extremely surprised when after about three months of use I found black sediment or whatever the black slimy stuff was deep in the straw and in the mouth piece and around parts of the inside of the lid. Mind you, this was after regular cleanings as per the directions! This was not noticeable immediately. I began to see this after daily use for three months or so. You probably ask, "why didn't you see this sooner?" Again, I will state that the slimy stuff was way, way inside of the innards of the bottle and not noticeable unless seriously looking for it. Had to use "special tools" (chopstick, skewer, and Q-tips) to wash the inside. Cannot recommend. Maybe I'm too fussy or just don't like the idea of having this stuff in my water.