<P> The popularity of Rolling Rock ponies has led to the folk etymology that "pony" is from the Rolling Rock horse logo . This is incorrect: the term "pony of beer" in the United States predates Rolling Rock (introduced 1939) by over 50 years, and advertising for Rolling Rock from the 1950s uses the term "pony bottle" generically, stating "...Rolling Rock is the Largest Selling 7 oz . Pony Bottle of Premium Beer in Pennsylvania". </P> <P> Among Mexican beers, Corona sells ponies, branded as Coronita, from the Spanish diminutive - ita . </P> <P> In Australia, a limited range of beers are available in a 250 ml (8.8 imp fl oz; 8.5 U.S. fl oz) bottle, nicknamed a throwdown or grenade . </P> <P> In the United States, small bottles are most popular for the on - premises market, where they are sold by the bucketful . The motivation in the 1970s was to target lighter drinkers, and to ensure that the lager beer stayed cold until finished . The market for beer in small bottles is smaller than that in regular size bottles, which cause added difficulties and expense: the bottles themselves are harder to source, and require either a separate bottling line or retooling the bottling line between runs . As a result, US craft breweries only rarely bottle in small bottles; temporary examples include Flying Dog Brewery (2007--2009) and Rogue Ales (2009--2011, using extra bottles from Flying Dog). </P>

How many tumblers can fill a beer bottle