I was looking for a water bottle that keeps my water cold for a long time and for a water bottle that was not complicated and hard to open. I have arthritic thumb joints and most of the bottles that I saw in stores involve using a lot of pressure to push a spout up or unscrew the top or some other difficult maneuver that I know would cause me a lot of pain. I found the Simple Flip Lid on my 32 oz Summit bottle opens easily! All I do is push the release button and the lid flips up! Easily and without causing pain in my thumb. It also closes easily. I also found that I do not have to lift up the bottle as I drank. I just suck on the spout and the water flows. I think these should be sold where older people who have arthritis can get them. Another reason I use this water bottle is that if I drop it on the floor, water does not spill out of it. My last water bottle, every time I accidentally knocked over the bottle, there would be water everywhere. So keeping my water cold, the easy flip lid and not spilling water when knocked over are my three reasons for liking my Simply Modern water bottle. It is the 32 oz Summit.