The container has no vent; so - when the temperature is warm during the day, the gasoline vapors push the plastic walls outward which is fine. The trouble is, when the temperature drops, the plastic walls get sucked in, crushing the container and putting a terrible strain on the plastic. The next day when the sun comes out, the container "re-inflates." I could loosen the cap to let it vent, but then I'll have some gasoline with very expensive synthetic 2-cycle oil getting evaporated. Is there a solution other than keeping the container inside the house where the temperatures are more stable ?