Exaco Aerobin Compost Bin 55 Gal Insulated No-Turn with Leachate Collection AEROBIN-200 NewThe Aerobin 200 offers the same efficient, low maintenance composting as the larger Aerobin 400, but in a compact 55 gallon size. It features a patented internal aeration core that eliminates the need for turning, while insulated walls and lid retain heat for year round performance. A built in 2 gallon base reservoir collects nutrient rich compost tea via an updated hose and tap system.