David C.wrote a review of Hydro Flask 21oz. Standard Mouth Water Bottle on July 10, 2012
Hydro Flask is simply the best. I put ice and water in it from 5:30 am before I go to work. Get to the gym at 7:15 pm and the water is still ice cold. The outside does not sweat and it does not get cold. I even put hot water in it overnight and the following day it is still warm. Work like they say it does. This is simply the best. I ended up buying a few more for friends/family.