Before prohibition, beer had been mainly distributed in bottles, and by the tap. Canned food had already been established, leaning many beer companies to look into canning beer. Unfortunately there was a problem: the  cost of the materials and the need to have a strong enough can to withstand the pressure from pasteurization . When prohibition had been repealed in 1933, the American Can Co. created "Keglined" cans that solved the problem. The first company to implement these "Keglined" cans was the Gottfried Krueger Brewing Co.    This was the first official can on beer produced, and  only had a 3.2% alcohol content, which as insane as it may sound, was the highest alcohol content allowed for consumption in 1933! Cheers to them for gifting us with the canned beer we love today! *Disclaimer : Facts are not ours and have been researched/received from:  HERE , go give this site a look for more information!.