A barrel with a large, securable top is the key. We found 4 of these 50 gallon barrels through a post on Freecycle
. They originally contained grains, and came from a brewery. These barrels are light enough to transport easily, but sturdy enough to take a beating. The large opening makes it easier to put organic material in the barrel, and the screw top lid easily contains everything as the composter is tumbled. A word to the wise: leaving the barrel upside down in the winter is not advised. We found one of the lids frozen shut when left in this position!