You'll need to slim down your choices by choosing either a backpack or a shoulder bag first, whatever suits you.
Looked at some of the Lowepro backpacks and Slingshot bags recently, tried them, too slow for access, for me anyway.
Tried a few Lowepro Nova shoulder bags, 160AW and 180AW, Nice bags but too small if you have any larger lenses, like my Nikon 70-300. Close fit in the 180, but I also have a Sigma 300.
Then tried he Lowepro Stealth Reporter D100 and D300.
In the end with a lot of chat about old cameras and their adventures and a bit of haggling, I managed to get the Stealth Reporter D300 for the price of the Nova 160AW. I asked for some discount, he gave me 22% off, made it cheaper than any web price I saw, and I learned a few things too, he was a pro Canon owner, but knew his Nikons too.
Great shoulder bag, small from the outside, light, comfortable, more space inside than you'll ever need (sounds like my old Alfa Romeo 146), if you filled it out with lenses and cameras, it'll be too heavy.
Currently holds a Nikon D300, Nikon 28-70DX, Nikon 70-300VR, Sigma 300, batteries, hoods, polarisers, UV filters, D300 manual, Canon Ixus 60, notepad and pens, cleaning kit, and there's still room for a water bottle and snacks and more, even my old D100 and it's batteries.
Fast access slot on the top and shoulder strap and carry handle attach to the side of the bag, so you can pick it up without zipping / clipping it shut and nothing will fall out.
Glad I chose it over something that was a tight fit, I have a cupboard full of high quality camera bags that I had to ditch as soon as I bought a new lens, or a slightly bigger camera.
