which backpack for Nikon D800+F4-24-120 attached and Nikon D3s+105 attached + 2 speed lights.thanks

I love my Think Tank 'Airport Commuter', and this might be a good size for you. Would also allow a few lenses too. The Think Tank bags, of which I have several are all top quality. They do have some smaller backpacks, Hard Drive series I think. The Think Tank web site has good images of the products and some decent video's. Definitely worth checking out.  I also like a Kata bag I have.