RotopaX RX-4G Gasoline Pack - 4 Gallon Capacity MOUNTING KIT SOLD SEPARATELY - in order to create complete usable kit; order a Container, a Mount Plate and a Pack Mount ADDITIONAL ADD ONS - to add more containers to an existing kit, add a Pack Mount Extension to your Container order LARGE CAPACITY - This tank measures 36 x 14 x 14 inches, weighs 7.5 pounds empty, and can hold up to 4 gallons EXCEEDS ENVIRONMENTAL REQUIREMENTS - the fuel packs' state of the art molding technique exceeds the EPA (Environmental Protection Agency) and CARB (California Air and Research Board) requirements