i was looking at these online. i dont really care about it for vegas, so many things are open 24 hours that buying a water at 3:00 is not a problem. but when i travel other places, id be interested. the only reviews i could find were of people being really mad that its meant to be plugged into a car lighter and you have to buy a seperate adaptor to plug it in at home (or in my case, a hotel). i cant find much useful information on how it works (or doesnt work)
https://www.amazon.com/Portable-Fridge-Cooler-Warmer-Office/dp/B008DH3V9E
https://www.amazon.com/Portable-Fridge-Cooler-Warmer-Office/dp/B008DH3V9E