Ideal shoulder

I carry a box D90 fitted with 35mm
the 18-55mm + charger in one of the side pockets
50mm + 12-22mm in the other pocket
12-22 of the visor take place at the bottom of the main pocket
small pocket for memory cards
By holding the bag SB600 flash can also store it for the trip.

Manufacture of high quality, hard bottom is well thought out.
For me the shoulder strap is more convenient than the backpack.
I do not use all my goals and flash at the same output, before I make a choice.