I've been a fan of Treesje bags for a long while now, if NOT a fan of their somewhat exorbitant prices! However, the current recession does have a silver lining -- formerly gasp-inducing priced bags are now almost affordable. Note -- I said 'almost'.
Case in point -- the Parker bag, with a price tag slashed in half, would be a perfect bag for fall. The slouchy hobo shape guarantees it will hold tons (in addition to looking cool, of course) and the hardware and seamed detailing lend a sleek, urban look to the bag.