I also have several where I drilled a hole and use a screw to plug them..fill my riding lawnmower up in no time flat instead of playing the “tipping game” with the can to replenish the air every few ounces....
Oddly enough with vapor-less gas containers are empty and then open for refill any fumes inside the container will escape at that point. So I don’t really understand the ingenuity of a vaporless gas can.
I use a ‘wing screw’ so I can just turn it with my fingers.