Here's a hint, NONE of them is keeping ice good in my cup for hours, period.
I can't complain. At 6:00 AM I put about 1/2 cup of ice cubes in my 30 oz cup and fill it with water.
By 7:00 Am it is sitting on my desk at at work at 90 degree ambient temp.
By 9:00 The water is gone and I add two cans of diet Coke from the fridge. By noon I add another two cans of diet Coke from the fridge.
By 1:00 PM the ice is gone, but the soda is still quite cool at 3:00 PM.
It does not quite compare to a good Stanley thermos bottle, but it is a lot handier and still does well enough.
