Trash's Courier Packs are designed to be great courier work bags, with large, box-swallowing inner compartments, organizable outer pockets, and padded, comfortable straps and bag back.  A great courier work bag is more than just for messengers, though-- to us, if the bag is designed for comfort under heavy loads for an 8 hour shift, it'll do the trick even better for a shorter commute where you need to haul your personal office around.