Shop for Outdoors at The Home Depot. Featuring two 50 Gal. (6.7 cu. ft.) tumblers, the Lifetime Dual Compost Tumbler is the perfect addition to your backyard. The ingenious tumbler design is perfect for easy batch composting. Both tumblers turn for balanced rotation, and the internal aeration bar mixes compost and provides air flow. Constructed of high-density polyethylene (HDPE), the Dual Compost Tumbler is durable, UV-protected, and has dark, double-wall panels to absorb and retain heat. For added convenience, it has an extra large removable lid and a spring-loaded pin that locks rotation during filling.