from GrogTag:

Naked kegs deserve labels, too! Join the Keg Clothing movement and decorate your blank homebrew kegs with our functional and reusable Keg Labels! Keep your most important notes right on the outside of the keg where they are easy to get to, like the date you added the dry hops, or even what yeast you used. Whatever you need to know, our Keg Labels will help keep you organized and your kegs looking good!.