The Hydroflask kept my daughter's water super cold during a baking hot road trip. I had a recyclable plastic water bottle and drank warm to hot water.
I usually don't buy into my daughter's fancy waterbottle addiction and stick with refilling empties. The Hydroflask stainless steel, double-walled, slip-proof water flask with a leak-proof lid is worth having! My kid put water and a few ice cubes in her lovely flask before we hit the road while I had frozen a Daisani waterbottle overnight. By noon I had hot water, and she still had cold water.
Then someone dropped a camera bag on my water bottle and a lot of my warm water escaped onto our camper van's floor.
I made my kid share her cold with the dogs.
I'm getting the 40oz version. She has a 64.