Coal bunkers | Capper coal bunkers provide a clean and weather proof storage solution for your coal. Coal bunkers allow you to order large quantities and store the coal at your home, ensuring it is kept dry. Our plastic coal bunkers are a superior product in their quality and functionality. All the coal bunkers feature a top lid and a smaller door on the front for easy access to your coal. Capper Tradings Coal bunkers come in large, medium or small sized plastic bunkers.