Okay, now that I'm home I can share with you my pelican case set ups...
The 4x5 which is the 1560sc
Have to apologize, I've actually been going through a consolidation, and So many of my holders aren't in here so it looks a little sparse, but it holds everything I need.
Body, 4 lenses, up to 16 standard regal/fidelity holders, compendium, light meter, stack of filters.
In the lid I keep extra pencils and dark cloth and desicant packets.
Next, the model shoot case 1510sc, holds 2 35mm bodies and 1 Mamiya 7 body, 3 canon lenses, and 3 Mamiya lenses, and a few filters and film (normally in the top left hole, the excess film scattered is part of a "cleansing" I'm doing, I'm not allowed to touch the fridge until I kill my old film but normally it looks a lot cleaner)
In the lid I have a 15 inch laptop and model releases, and the side pouch keeps sharpies and electronic triggers etc.
And finally the other 1510sc (with foam lid... This was mostly due to the fact that for this camera system I wouldn't need a laptop, and I really didn't need any excess space for triggers or anything like that, and I felt that the extra foam on the lid would help protect the body and lenses which are just a little bit heavier and a little less robust than the Canon gear, having the choice again, I probably would have gone for the fancier lid, as it's really handy for a lot of other things, but I'm not unhappy with this case it works and protects my gear really well.
As I mentioned before, a body, 4 backs (one is a 70mm back so it's different looking) and 3-4 lenses (assuming the extension tube could be another lens) and still room for the Polaroid back which I will probably replace with other stuff, but that center top hole is big enough for another body with back attached to it.
All of these cases have wheels... Are really tough, etc, and the 1510's can come with you in the plane for overhead storage to prevent theft from baggage guys who often steal stuff from the cargo area of the plane ...