D300 plus 17-55/2.8 is a pretty heavy loadout. With grip attached, the rig fits snugly in a LowePro MicroTrekker 200 backpack, and can be carried around in some comfort. I now generally prefer the D5100 w/kit zoom for excellent image quality, light weight, and that fits easily in a Domke F-6.
Rico Tudor. Leica M4, IIIb, 28, 35, 50, 90, 135, 280. Contax T, RTS; Canon; Nikon; Profoto