I am a Diet Pepsi addict and have been one for 30+ years. Every summer in N.Y. It gets hot and humid as hell here. Now, I love my DP but the one thing I hate is when it gets piss warm. Ugh 😣. So with summer approaching fast, I figured it would be a good time to try this baby out. It has worked like a charm so far but, hey, it's early spring and not blistering hot sooooooo........ I went to Long Island a few days ago and filled up my 16.9oz bottle, stuck it in my Frost Buddy 2.0 and away I went. It was 94 degrees outside that day there. After number of doctor appointments and sitting in the bright hot sun in the car, my DP was still cold!!! It was a miracle. Now this summer will be a much better one and I'm happy I don't have to give up my favorite drink in the summer anymore. I've since bought 2 more items and I'm working on deciding on my 4th. This does work like magic and it's worth every penny.