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If you add a full lens bag it will probably block the small pocket. Or you can just have something small in the pocket. You have to look at some pics because those pocket are not like a "normal" pocket. And they are small so it's not a big deal. I have never used those two pockets. Those two bags (200AW & 180AW) can take a lot of equipment. So if attaching extra lens bags it will be very very heavy. You can easy have a 5D2 and 4-5 lenses without any lens bags.
I think you can have a 5D2 with a 70-200/2,8 IS standing in the bag (180AW) but I don't know. The 180AW will take a larger lens standing than the 200AW also. You can also have a camera in the front pocket (or a lens).
I can very easy use my 180AW with these equipment:
2 bodies 1DX & 100D
4 lenses: 70-200/4 IS--Sigma 150/2,8 macro--16-35/2,8 & kit-lens EF-S 18-55
memory cards, batteries and a few other small things