That I get in the camera compartment of my backpack:
Nikon D7000 + MB-D11
Nikkor 24-70 2.8 (lying on camera)
Nikkor VR 105 2.8 (lying)
Nikkor 85 1.8
Nikkor 50 1.8 with attached Geli
Nikkor 40 2.8 with attached Geli
Nikkor 35 1.8 DX with attached Geli
Nikkor 18-200 3.5-5.6 VRII (lying)
SB-800 (horizontal)
+ Empty compartment
Everywhere is nothing to the Geli Upside Down is located on the camera and the lens is in the standing position.
I would get even a 70-200 2.8 in the backpack, but I would probably have 2 small primes stacked in a timber.
But I would really get camera + handle + flash + 8 lenses in the camera compartment.
In front one can poke still a lot and attach a couple of tripods.
The backpack would go through even as hand luggage on the plane, the front compartment you should not fill, however.
The Lifetime warranty ensures additionally that I have no concerns for the future.
Just buy it !!!
PS: I've unfortunately only for comparison Crumpler backpacks and not of Cullmann or KATA. The Crumpler backpacks have a better exterior material, but the Flipside 400 has a built-in rain tarp. By the by, full top!