Need a Coors Light keg for your next party? A full size keg (15.5 gallons) of Coors Light lager is the perfect beer to serve your guests. Light in alcohol and only 102 calories per serving, but full of the cold filtered flavor that makes Coors Light ones of the worlds most popular brews. Coors Light is famous for using clean Rocky Mountain spring water, 2 row lager malt and 4 unique varieties of hops to create its clean, crisp taste.