Jerrycan
It's amazing how much clever engineering went into such a simple device.<p>And how much it is forgotten today. I have a couple 5 gallon plastic gas containers. They are terrible in comparison. For example, instead of an air pipe to allow smooth pouring, there's a separate cap which has to be unscrewed, and then the cap is inevitably lost.<p>Modern ones have this spring-loaded spout, which is supposed to prevent spillage. It inevitably <i>causes</i> spillage, because the spring is so strong you cannot regulate the flow, and the tank fills too fast and overflows. I <i>hate</i> spilling gas every time I load the lawnmower tank.