I did a lot of research before using Hydro Flask. I was very excited to use it. The bottle looks great. I chose the standard 21 ounce sunflower. At 7:30 am I filled the bottle with ice and water. I was busy with work and didn't open it until 10:30 for a drink. The ice had melted and the water was cool but not cold. I'm a bit disappointed. Addendum added: I ran the recommended isolation test and it failed the test. Returned via Amazon. I reordered directly from Hydro Flask and got the perfect bottle.
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