Very similar to my Lowepro Vertex 200. Except the Vertext has a tripod harness and waterproofed zippers on the larger compartments.
I use Nikon's 40/2.8 macro as a walkaround. That's on DX. I find a 35 (50mm equiv) a touch wide, and 50 (75mm equiv) a touch long. Hand me a D700 and a 60/2.8 macro and I'm happy.
I use Nikon's 40mm f/2.8 macro as a walkaround lens: its the PERFECT focal length for my shooting: 50 is a touch long, 35 is a touch wide. It's a DX lens, though, so it's supposed to be used like a...
You, sir, need help of a professional nature.