ComposTumbler 03001 Two-Chamber 11-Cubic-Foot Galvanized Metal Compost Bin Two chamber design of this composter allows you to continually add waste Internal mixing pins help to properly mix new compost materials with old Drum of the composter holds 180 gallons of material Sits 27 inches off the ground, so it won't leak into the ground or be bothered by animals Aerator/drainage units on the doors of the chambers, along with the screened ends allow a constant flow of air