I have two bags. My small one is the LowePro MicroTrekker 200. I usually carry the D3 with 24-70 attached and the 70-200. Also has room for my SB-800 and two sets of batteries.
My 'big' bag is the LowePro CompuTrekker AW. It carries all the same plus my light meter and a bunch of other accessories (battery charger, AA battery charger, WhiBal cards, and a partridge in a pear tree). I must say that I'm not very happy with the way my 15" MacBook Pro fits. I'm on my second bag and the zipper for this one has separated on the laptop pouch. It's not really a LowePro problem, the plastic zipper teeth separate from the fabric. They need to make the pouch just a tad bigger or use a more industrial strength zipper. I'm seriously considering trying another brand that might hold my laptop and camera gear, but it's getting too heavy now with all the f/2.8 glass
