A full keg, also known as a half-barrel, holds 15.5 gallons of beer. Reducing spillage while pouring contributes to the number of beers that can be obtained from a full keg.
Other sizes of kegs include:
A keg is made from stainless steel. To create carbonation in beer, it is pressurized with CO2. A full keg may be refrigerated for up to 120 days before the beer is considered stale.Learn more about Food Facts