I think those hold five gallons too. I can get two new five gallons blitz cans for that price.
Just thinking it will keep the "petrol" better than the plastic, but if you're rotating it out on a regular basis you should be good.
Do you bother using any gas stabilisers?
BTW I wish I could get my wife to realise that we need to do some limited prep'ing. She just doesn't believe in it. Too wrapped up in reality TV.