I'll take this bag with:
EOS 1000D with battery grip and lens aufgestektem 28-105 USM + Zusatzobkejktiv a 50mm 1.8
or
Camera with lens and battery grip + Aufsteckblitz Metz 52 AF 1
Without battery grip also two add. Medium lenses would fit, or add. Lens and flash. In the four side pockets naturally fit even pure a lot of small stuff.
It's a shoulder bag and therefore you should consider already that one gets to feel after some time the invitee weight. Here a backpack is definitely kompfortabler.
Conclusion: Expectations exceeded!