Interesting question.
west lakes, would it be possible to stash one-two days worth of supplies into one of these kind of bags (sorry, don't know the English word... ):
I would like to say it could fit in your front seat pocket, depending on size. What about putting it on the floor? Is it fragile? Could you double use it as a head rest?
This is small and handy and a far cry from the women going down the chutes with their entire shoe collection.