I just had a thought.
I'm going to use my wife's cloth laundry basket for my next grow. It's about the same size as a full size beer keg, maybe a little taller. Should be an interesting grow. Maybe throw a blackberry kush or Sour Hound in it and see how much of a difference using a 30-40 gallon "pot" makes, right next to a 5 gallon bucket with the same thing going at the same time.