For something that small, I have a Billingham Stowaway Pola, fits an M body w/ lens attached, and has enough room for another lens, and maybe some film, not much. But it only has the one main compartment, you'll have to rig up a divider between the spare lens and the body. I usually just stick one of the random dividers I have laying around in between, but one of these days I should actually just sew some velcro strips inside to hold the divider in place.
my daily bag is a domke 803 though. But a bit bigger. (one body, 3 lenses, flash, meter, filters, lots of film, wallet, phone, keys, map, pens, notebook, novel... it doesn't LOOK big enough to fit everything that goes into it though.)
-Brian