The Mantis ComposT-Twin revolutionized the composting process with this large-capacity, dual compost tumbler. The easy-use, high-efficiency unit, has twin chambers and holds almost 25 cubic feet of compostable material (10 bushels in each side). An improvement on single-bin composters, this Mantis composter lets compost “cook” in one composting bin while adding more kitchen and yard scraps to the second composting bin, making a constant supply of compost.