This tough, durable and lightweight mid-size bunker provides compact and weatherproof storage for coal or other solid fuels. It is. This model can accommodate a total capacity of 300 kgs which is approximately 6 cwt / 6 bags of group 2 household coal. Rotationally moulded from premium grade, Medium Density Polyethylene (MDPE), this grit bunker is durable in all weather conditions and has been tested in the most extreme operational conditions.