I also have one of the RBI racks with belly heat. The 32qt size has been perfect for all of my balls so far, and I am intending on getting another one some time early next year. I love that you can use the dividers to make more space. They also have the bigger size rack for the really big females, and I will probably end up with one of those when I have some really big girls. I would highly recommend them, just make sure you get a good thermostat to regulate them.