Why does beer only get one day? It should it get a month. It unites America.. Beer is one thing we all agree on! The koozie, the beer helmet that lets you drink two beers at a time while keeping your hands free to eat a hot dog, beer pong, the beer bong, the pop top, the twist cap, the wide mouth aluminium bottle and the wheelie are among the greatest beer inventions of all time. To celebrate National Beer Day we put together a collection of some of the greatest beer inventions and more. Bottoms up!