Thanks Guys,
I can put two large lenses, a full size body, and accessories such as a flash or third lens. Plus a laptop fits in the sleeve in the back, and there are a couple of exterior pockets.
One of the tripod's feet will snug tight in the "V" of my rack, and a bungee cord holds it in place.
I do like the way Ortlieb hardware attaches to the rack. If I were to do it again, I would use a QL2 top rail, because the hooks are easier to move out of the way if they are poking you in the back when you are wearing it on your shoulder.
I use a divider
--A