Full disclosure: I’m not encouraging anyone to sneak this into the stadium. But just imagine if you could.
The BRÄULER, simply put, is 64-ounce container to fill up with beer (looks like a very large thermos, one that is about a foot tall and 4.7 inches in diameter).
Fill it up at home — or at a friendly pub, perhaps — and take it to the tailgate. It will keep your beer fresh, retaining carbonation and flavor throughout the day.
There are other Bräulers have toppers that serve as CO2 injection systems. Or the PicnicTap combo comes with, of course, a tap.