how big pony keg
Beer Pony Keg Sizes in Gallons. Beer pony keg sizes in gallons are 7.75 U.S. gallons (29.33 liters) of fluid. It is also known as the quarter barrel. This is 50% of the size of the average beer keg. Its size is approximately a quarter of a barrel, hence the name. It can serve about 82 twelve ounce cups.