Gasoline is one of the most flammable liquids there is. Its vapors are completely invisible, very heavy, and will secretly travel like a snake from room to room. That's why you should never store gasoline inside your home or basement. Always keep gasoline cool, stored in a tightly sealed, approved safety gasoline container that is prominently labeled and out of reach of children. Keep this container in your garage (detached is preferred) or an outside storage building.