[paultannenbaum]

Since we are going off on a tangent, a cool camping hack when you don't have ice is to stuff a beer in a tube sock, dunk it in water, and hang/tie it to a tree branch in the shade. If there is even a touch of wind it will be nice and cold in 10 minutes.

[aaren]

This is much more elegant than the spinning trick, as it doesn't require energy input.

Works really well in deserts, if you keep the sock in the shade.

[staunch]

I wonder if you wound up the sock and let it spin if you'd get something virtually equivalent to this machine.

[aaren]

I think you need to experiment.

[jlgreco]

Evaporative beer cooling.. very clever. I wonder if there is a market for a product dedicated/optimized for this (incorporated drawstring/hanger, ideal material, etc.)

[toomuchtodo]

"Billy Mays here for Beer Sock!"