I keep my adult BP's in a CB70 from animal plastics. One thing to keep in mind with a rack system, particularly if it has open sides, is that you need to have the ambient temperature in the room high enough. I did not know that when I first started out. My CB70 racks have closed sides and dual side heating. But if you choose an open rack, then you may need a space heater or some other way to raise the ambient temperatures in the room.