Just curious. Classic briefcase dimensions were originally dictated by the need to accomodate legal size documents (11x17"). Since almost all non-legal documents are currently 8.5x11" and the largest item most people carry in a briefcase is (a) a laptop or (b) their lunch - what are YOU personally carrying that needs a full sized briefcase?
I currently have three that see no use and am using some smaller bags instead that will hold 8.5x11 documents vertically and a smaller notebook, and can be slung over a shoulder or fit in most panniers.