So I'm trying to find a fridge for my wife's car as a Christmas gift. It needs to be as small and light as possible but still hold at least 2 one gallon milk jugs. all I have is an ARB 50, and that is far too big. I think the 35 is too big as well. Does anyone have a suggestion based on actually having one? All of the websites I see show external dimensions but internals. I also seem to have no retail sites within a few hundred miles, so this is probably an order item.