Let's take a closer look at the particulars for one of the most common sizes, the pony keg. A pony keg is an informal name for the quarter-barrel keg, which holds 7.75 gallons in North America.

meaning the host should purchase two pony kegs or one full/half-barrel keg. Beyond the size, it's the price tag that varies most from one brand to the next. Full kegs tend to run in the $100-$250 ...