You seem to have just about the same equipment that I will have and need a bag for. Would it be possible to take a picture of the open bag with the equipment in it and post it so I can see how well it fits?
Grandpaw,
My bag wasn't specifically laid out for this arrangement and I'm busy at the minute so it's not quite as neat and square as it should be as I just chucked the stuff in for you photo request. Please don't judge my neatness by these photos, or the fact that I had to use my iphone to take them I think it confirms what you can fit into it and when it's laid out properly it'is actually very tidy and professional looking.
On the left is a D7100 with Tamron 150-600
At the back is a D800 with 24-120 F4
Top centre is the 70-200 2.8 VRII,
On the right is a 16-35 F4, 105 2.8 Macro and a 50mm 1.8G.
The flash at the top is an SB900. I could get both in if I arranged it properly.
The bag at the side is the Lowepro 11x26 with my wife's Tamron 150-600 to show that it fits, albeit it's a very snug fit.
Frankly, anything bigger than this bag would be too heavy to pick up or take on a plane as carry on. It also has the usual tripod straps and more pockets than you could ever use (Famous last words).
They do make a Vertex 200 as well, however this is a good size for me and the thing I really like about the 300 is the cover that goes over the straps at the back. This makes it really neat as carry on or when just using it as storage around the house as the straps don't keep getting in the way.
The funny thing that this picture highlights is the size of the Tamron 150-600 next to the 70-200 2.8. I used to think the 70-200 was a big lens
I hope this helps you make a decision.