Hi Paul,

Gear will generally multiply to fill available space, so it's best to 1) pick all your gear and then 2) pick your pack.

There are some basic issues to deal with; especially, how do you want to carry the camera on the go? Related of course are what camera, lenses and tripod? A D3S? An E-420? A compact CF or full-sized aluminum tripod?

There will be a hundred packs to select from once you finalize your gear list and especially have an idea of total weight. Hopefully you'll be able to use a pack that's not going to add another five pounds to your load.

Cheers,
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--Rick