A pony keg is a small beer keg that typically holds about 7.75 gallons, or 30 liters, of beer. It is often used for parties, gatherings, and events where a full-sized keg would be too large. Pony kegs are convenient for serving a moderate amount of beer without the need for extensive storage or handling. These kegs are commonly made of stainless steel and feature a tap system for easy dispensing. They are popular among home brewers and are often used to serve craft beers from local breweries. Pony kegs can be found in various styles, including lager, ale, and stout.