Hi,
I use a Billingham insert in my 803. It's the insert with places for 2 enses. But because the M lenses are small I can put two lenses in each hole. Antoher lens on one camera aside of the insert. One camera without lens in the front pocket. If nesceccary i can stuf in a Canon G6 or something else.
Just a great little big bag. Mine is black and looks even smaller.
Cheers,
Michiel