Current regulations mean draught beer must be sold in pints (equivalent to 568ml), halves (284ml) or the little-known one-third measurement.

BBC: Changes to Isle of Man alcohol measurements scrapped

Last year, American companies Firestone Walker Brewing and Miller Brewing won the World Beer Cup championship for both midsize and large breweries, respectively. (Small went to a German brewer.) And Sierra Nevada Brewing's Draught Ale and the Boston Beer Co.

FORBES: Tastemakers: Wine, Beer and Spirits