Butane gas should be stored in a cool, dry, well-ventilated area, away from direct sunlight and heat sources. It should be kept in its original container or a specially designed storage container. The storage area should be kept away from sources of ignition and should not be near open flames, sparks, or electrical equipment. It is important to follow the manufacturer's instructions for storage and use, and to ensure that the storage area is secure and inaccessible to children and unauthorized individuals.