You can tell from some of the solutions in this thread that you really have to look everywhere for a bag. Sometimes the strangest items fit your gear perfectly.
I have kind of a weird little setup, so I poked around for a while before I discovered a good 'ole Jansport backpack that fit everything just right.
I worried a lot about whether to run from the bag or not, and ended up doing a little of both. My NJB3, PB224, and AD-20 are all wired up in a hard case with their batteries, and that goes in the backpack. When I get there, I just pull the box out and open it up. (Ok, actually I have to plug the optical cable into the NJB3, but that's no big deal.) It sorta gives me the best of both worlds.
The Jansport has two main pockets, so one holds the mics and recorder hard case, the other holds my two sets of cables. A little pocket holds my Oktavas (spares, mains, depending on situation), and there's still an outside pocket for all the misc.
Chuck