After looking for a quality water bottle I bought this. The packaging says that hot drinks stay warm for up to 24 hours and cold drinks for 58 hours. The first time I used it, I filled it halfway with ice, poured water in, and left it in the air-conditioned kitchen while I worked around the house. Within an hour all the ice had melted and the water was cool but definitely cold. After drinking the water, I filled it with ice to the brim and then poured water in. I went back there after a little over an hour and again all the ice had melted and the water was barely cool. I tried again, filled it with ice again and left it overnight and when I drank it in the morning the water was room temperature. All three times it was sealed tightly and the bottle doesn't appear to be damaged at all. Very disappointed that I spent so much money on a vacuum flask that does exactly the same thing as a regular plastic water bottle.
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