Mine's a Lowepro Fastpack 250. In the lower compartment I fit the RZ with one lens, film back, and WLF fitted, another lens, and a spare film back. The top compartment takes filters, possibly a third lens and extension tubes.
I try to put a vacuum flask in the netted side pocket, but the flask sometimes slips out when I put the bag on my back. I'll generally have some food and a waterproof on longer trips; the food goes in any spare space in the top compartment and the waterproof is strapped underneath the outside pocket. A folded reflector can fit in the compartment designed for laptops.
It is, to be honest, a bit of a squeeze to get it all in. If a prism is in use, it won't be possible to store a lens in the bottom compartment as well. I have an incentive to try and cut down the number of lenses carried, and stuff kept in the top compartment needs some extra padding - a woolly hat does the job !
My ibuprofen fits well in a little pocket in the top compartment ...
There is I think a slightly larger model, the 350, which should be less of a squeeze.
I don't have a method of carrying the tripod in or on the camera bag.. I use a very large Manfrotto ART 750 which is carried in hand.
Kevin