Keeps water icy cold all day/overnight, as I would expect from Thermos. We appreciated the larger size, it holds more than a "funtainer", which it was replacing. Haven't tried hot beverages yet but I'm confident it will do the job well, if it doesn't then I'll edit my review. FYI: the mouth is quite narrow, so you will need smaller ice cubes (we have a tray from Kmart that makes bullet shaped cubes) in order to get it in there. The bottle itself is slim enough to fit in the side pocket of a backpack, but it is quite tall so if the pocket is shallow it may fall out. We bought two, grey and teal. Kids have already dropped them, no dents or scratches (yet). Would happily buy another.