Here's my main bag:
It contains:
Canon EOS 40D body
Canon BG-E2N battery grip
Sigma 10-20mm f/4-5.6 EX DC HSC lens
Canon EF 17-40 f/4L lens
Canon EF 28-70 f/2.8L lens
Various Hoods for all above lenses
Tiffen 77mm Circular Polarizer
2 Canon Speedlite 580EX flashes
2 Honlphoto speed straps
2 Honlphoto speed gobo/flags
1 Honlphoto 8" shoot
1 Honlphoto 5" snoot
Canon ST-E2 infrared flash transmitter
Canon off-camera shoe cord
Stroboframe Quick Flip flash bracket
2 Sto-Fen white flash diffusers (why?)
16 Sanyo Eneloop AA batteries
2 LaCrosse BP800 battery conditioner/chargers
2 Canon, 2 Sterlingtek BP511 batteries
2 Canon CG-580 battery chargers
5 Kingston 4GB 133X Elite Pro CF cards (1 in camera, 4 in hard case)
Cleaning kit
I have a small waist pack as well, with a Canon Rebel xti in it, with a kit lens and spare battery/charger and a 2GB El-Cheap-O CF card for my backup. That's my wife's camera. Dual purpose!
I have a third bag too - I found a big
Adorama 45" padded tripod bag, and it carries:
Bogen 3036 tripod with Manfrotto 3047 head mounted
Slik Pro-Pod monopod
2 Westcott 750 Basic light stands
2 Photodex swivels
2 Photodex 45" convertible umbrellas
1 Photodex 40" white/gold reflector
1 Westcott reflector holder
1 Manfrotto super clamp