Review (5/5): Keeps drinks cold in 100 degree temperatures
Bought 2 of these and couldn't be happier. I use one for strictly water consumption. I leave on night stand and have cold water all night long. Also leave in hot car in FL sun and still full of ice hours later. Ice does melt within 12 hours if water level is higher than ice level, basically all the way full. If water is 1/2 an inch from full then ice lasts vdery long.
I have not tried to see how long ice lasts but I have gone over 16 hrs and still have ice. I've had the ice completely melt (when water level high) and water was still cold even after 5 hours after melted ice.