Michael Alestra wrote:
i prefer the lowerpro swing packs, makes it easy to access for lens switches.

+1

Christopher Hartman wrote:
I have a Lowepro Flipside 400.

I'm not sold on it.  There are some nice things about it, but I really would like a backpack that I can flip open and have it STAY open.  The way this is designed, you have to hold it open and it's annoying to me.

and...now...when I get my Tamron 150-600...that lens isn't going to fit.

It's already maxed out with a...

Nikon 16-35 f/4
Nikon 20-70 f/2.8
Nikon 70-200 f/2.8
Nikon 105mm f/2.8 Macro
Nikon 2x teleconverter
Nikon SB-800 speedlight
Nikon D700 w/grip

+1