When I bought my D70 I went through much hand-wringing deciding what bag to carry it in. My main "walk-around" lens is the Nikkor 17-55 f/2.8, which is rather large, especially with the lens hood on. This bag works great for me. It's the Tamrac 519 Pro Zoom Pak
http://www.tamrac.com/welcome.htm ), about $55 from B&H. There's room enough in the main compartment for this camera/lens combination and the camera strap. The pocket on the front is roomy, but barely big enough to hold an SB-800 flash. The two sidecars are what Tamrac calls its Modular Accessory System, or MAS. They come in a variety of shapes and sizes. I have a medium-sized rectangular one for filters and such and a medium-size cylindrical one for one extra lens.
I found the nylon strap that came with the bag to be a bit uncomfortable when this large bag is fulll of gear. So I bought one with better padding. This is from a manufacturer called Eagle Creek. It was something like $30.
I usually carry the Tamrac with the strap across my chest. This, for me, is the most comfortable carry, and I don't worry about it falling off or getting taken off my shoulder. When I have the camera out, I just hang it around my neck by the camera strap, which happens to also be a Tamrac item with a suede pad for the neck. This is a great rig for travel. I position it behind me for easy walking, and slide it to the front when I want to get to it. The limits are that once you've filled the bag and two outriggers, that's it -- unless you buy the belt Tamrac sells, then you can strap bags all the way around your waist. I bought one, but have never used it.
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David in Arkansas
Proud FCAS Member, PBASE supporter
http://www.pbase.com/arkie5700
I know art. I just don't know what I like.