In addition to the Carradice-type bags that run perpendicular to the frame, and may or may not work w/o bag loops on the saddle, I also wonder about the big revelate saddle bags that have a comparable volume to the Carradice, but run parallel to the frame and don't require saddle bags. They definitely don't have the old school looks:



They are possibly more water resistant than the Carradice but that's not really going to be much of an issue for the bike in question, it is mostly going to be a 2-3 month summer ride.