My Streetwalker HardDrive has in it right now...
...in the main compartment:
7D w/ 70-200mm f/4L IS USM
17-55mm f/2.8 IS USM
Helios 1,5/85 (in a compartment that usually has my 100 f/2.8 Macro)
50mm f/1.4 USM
SMC Pentax 1:1.2 50mm
Vivitar Series 1 7mm f/3.5 Fisheye Apherical
MC Peleng 8mm f/3.5 Circular Fisheye
(2) 580EX II's
Kenko DG Macro Extention Tubes
Kenko PRO 300 DG 1.4x TC
extra battery for 7D
CPL's for 67mm and 52mm
Sky filter for 52mm
Lexar UDMA USB reader
Extra RC2 plates and mounts (for use with superclamp or with borrowed tripods when I don't carry my own)
Giottos RocketAir Q-Ball
... and in the pockets:
AC adaptor (for T60)
batteries (AA, AAA rechargeables)
travel charger for batteries
charger for LP-E6 battery
various cords (flash sync cords, usb cords (2 of em - 1 Canon long one for tethering, 1 short one for UDMA reader))
Remote Timer/Trigger (TC-80N3 clone)
... and in its compartment:
IBM T60 Notebook
As you can see this bag can really haul a lot of gear, mine currently has 1 body, 8 lenses, and 2 flashes along with all the rest. Its a bag that if you pack efficiently will hold about as much as you could ever want to haul. What I really liked about the bag when I was shopping for it, is that you can configure the bag to be able to hold an EF 400mm f/2.8L IS attached to a 1D body and STILL have room for some other lenses along with it. Its not a configuration I have to worry about yet, but its nice to know you can go there. I love the bag for travelling. It fits in ALL overheads even when stuffed to the gills.
I usually travel with it with the tripod holder either holding my tripod or my small tripod bag which has 2 flash stands in it.
The bag is VERY versatile and comfortable, thanks to heavy padding on the back, so you don't really get too fatigued even after 5 or 6 hours of lugging it around airports.
I highly recommend it to anyone who needs a big bag that can haul a lot of gear + a notebook.