I don't mind a tight fit. But I live in a 350 sq ft studio apartment, so I have to use the smallest freezer possible. I'd rather put a collar on than have a relatively wide and bulky freezer. From the specs I have seen, a 5-5.2 cf freezer will be about the max I can use. So I have to find one I can order online, and one that will allow for 3 ball lock corny's and a 5# CO2 tank.