A:Answer Hi! Thank you for reaching out. You can fit the following keg sizes: 1/2 barrel, 1/4 barrel (short/pony), 1/4 barrel (slim), 1/6 barrel, and 1/8 barrel. For your reference, you can check the Quick Start Guide located on the features tab. I hope this information is helpful, and if you have any further questions, please feel free to ask! - Carl | Insignia Support