I have a Lowepro Event Messenger 150 (I think that's the specific model # - they make a series of them in slightly different sizes) that I use with my pair of Rolleiflexes. It holds both bodies, a hand-held light meter and a dozen rolls of film in the main compartment. In the front zipper pocket, I keep my Rolleinar close-up filters, a pen, a small notepad, some spare AA batteries for the meter, and loose change. There's a padded slot inside the main compartment you can keep an iPad inside or other similar device, and an outside unpadded back pocket that also holds a notepad or small book. Best part? Under $50. If that doesn't float your boat, I also like the Domke F2 bag, which I have for my Contax G-series outfit.