i have a 15cf kegerator, and it holds 3 kegs with my 20 lb co2 outside. it'll hold a 5 or 10 lb inside; a 20 is just too tall. looking to go keezer, though. i'd advise you to go keezer from the start. a 7cf or bigger is best. go 10 cf if you can. will hold 5-6 kegs, the co2 if needed, or 3-4 kegs and a fermenter for lagering or cold-crashing