i have a tamrac velocity 6 - and it is surprising what you can get into it, although it is a squeeze, the easiest fit is with the 50mm on the camera (30D) and then the 105mm and 17-85mm (both medium sized lenses) in the side compartments, then i have two extra filters (which arent on the lenses at the time) in their cases, space for a mini tripod (i dont use mine anymore since it wasnt designed for an slr), cleaning cloth and extra cards, and it looks rather inconspicuous/small.  It has the expansion compatibility straps on the side, so maybe if you could find some way of hanging your tripod off the side, but then i would imagine it would swing into your back incessantly. I'm planning on getting a monopod so it will double as a walking stick so i wont have that concern ;) 

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography