i use a pelican 1490 laptop case...fits my bigass sony vaio laptop and the usbpre next to it, mics and caps go under the usbpre, batts can go under the laptop....very nice for slimness and protection, the expensive gear all fits in one bombproof case.
then i also carry a dakine heli pro pack in with me, has all cables, the valence n-charge battery, shock mounts, flashlight, nugs, etc. and my stand strapped to it.
not all in one by any means, i suppose i'd need either a bigger bag or a smaller laptop to get any smaller. unless i could fashion a bag of some sort to strap around the pelican briefcase, might work...
(edit)
oh yeah...i can run everything from the pelican, no prob. just prop the laptop up on some extra foam i put in the case to allow ventilation (overheating/lack of ventilation was a primary cause of shutdown for me in the early days of laptop taping in this case)....prop the usbpre up on foam also to allow access to the controls from the side of the case, it's ready to go. the backpack can sit on the side someplace. oh yeah, i've also got a right angle usb adaptor, since the port is on the rear of the laptop, there's not rooms enough for an extra 1.5" that a standard usb plug uses, this one routes the cable directly up from the port and only uses about .5" so it can stay plugged in even while the laptop is fully inserted in the foam. that cable is run behind a custom piece of foam i put in the lid to protect the top of the gear, i can also stash notes/cd's/stickers in there too. i will put up some pics very soon, look in the rig pics section!
