How to make a stealth beer can for drinking in public

How to make a hidden cover for your beer can when drinking in public.

For those public situations when an open beer can is "frowned upon". It's camouflage for your beers! An open beer is "frowned upon" in many places. This little trick was taught to me by some of my softball buddies. I'm sure it's an old one but I'll share it with you anyways.
If you want to keep your brew on the down low then make a sleeve out of a soda can to cover up your beer can.