Hi Don, At our "Transfer Station", the new fancy title for the Town dump, I picked up some discarded oil containers. I chose the EXXON ones, being a nice bright red, and therefore easy to spot in the sail locker. Mine have been used for about two years now, and there is no problem with swelling due to gasoline expansion. They live in the bottom of my port sail locker, and so stay cool (lake water temperature). If you would like to add a bit of safety, then how about filling them when the outside temperature is cold, and then squeezing the oil container as you put on the cap to remove as much air as possible. Then the gasoline could expand a bit without bulging the container. None of my container has ever bulged. For longer trips with more engine running time, I have built myself a hose with an outboard pump bulb in the line (available from WEST Marine or probably any place selling outboards). Now I can put the 1 gallon tank in the cockpit, put the long end of the hose in the one gallon tank and the bulb with the short hose end is no inserted into the HONDA fuel tank where I can I squeeze the bulb until the tank is filled. No trying to hold a heavy gallon container; no spillage (over a hot engine); - total control of the refueling operation. Connie M15 #400 LEPPO