It fits my D80 and D90 with battery grips, my SB900, SB800, 9 lenses plus batteries, cables, filters. The side pocket holds a fold up Bogen stand and the other side pocket, an umbrella.
I can carry an extra shirt and hiking pants in their as well and my laptop. This is the best bag I've found for carrying all my gear around.
Since I have herniated discs in my neck the sling bags just dont work, to uncomfrtable. My old lowepro trekker could not carry half of what this can and I found it on sale for just $49.99 at Burton.
Thanks to the previous posters for the recommendation, my purchase was based on your reviews.