Smell. I have my gas can in my shop. I have one of the caps with a fuel line that plugs into the pick up tube, there is no gas smell in my shop unless I have just flown one of my gas planes. The plane/engine is the gas smell problem, not the can of gas. The same thing can be said for my glow planes. Even more my clothing after a day at the field flying glow planes. Some people run Coleman Fuel/white gas in there gas engines and then there is no smell at all. The gas smell only lasts a day or so anyway. Just a choice thing, I like them both.