There are some great bottle review videos out there, but few are as comprehensive as Kevin Ross' of TurfNet.com. Kevin compared Aqua Flask, HydroFlask, Healthy Human, Klean Kanteen, Laken, and RevoMax bottles for multiple cold and hot water tests. He charted the results and RevoMax was a top performer! That's due to our double-wall vacuum insulation, copper-coated core, and special quick-release cap that creates a double seal so hot and cold can't easily escape.
This video does a great job convincing anyone of who are the best performing thermal flasks on the market today, and is conducted by a 3rd party. Check it out!