I know weird question. I have a gas card that works in a few countries in Europe (read sponsored gas) but I will be traveling in some other countries as well. The gas card will work near the beging of my trip and not at the end. I could get gas cans of sorts but saving from the gas card would not make sense if I had to spend a bunch of money on cans. I would need the space at the end of the trip.

So anyone know of a way to safely and ecomically store gas?