I think you are going to have to go another route if you want the camera with 70-200 attached (assuming hood reversed).
If you do not want to attract "camera" attention while carrying the bag, I would use cloth type lens pouches--you could even make some from the bottom of the legs of worn out sweat pants. Then just get whatever messenger type shoulder bag that suits your fancy. The National Geographic bags look well made--but awful hokey looking at best. Tamrac, Lowepro, Nat'l Geo, Domke, Tenba and the others "scream camera inside me" and I don't like that some times. So----I use my CC Filson Medium Field Bag. Do a Google on that and you will find an EXTREMELY rugged heavy wax/oiled canvas duck and bridle leather shouder bag. My gripped 20D will fit in it with 70-200 attached and hood reversed. I can also put in a couple of other lenses in small cloth bags--17-85 and 30mm. There are two external snapped cargo pockets covered by the main flap. I can put a flash in one, snacks in the other, or my C5050 camera and the small FL20 flash, some spare batteries for Canon camera and flash (Oly C5050 takes AA's). There is a nice open pocket on the back for a newspaper, and two open pockets on each end. I have been out in an all day rain hunting with this bag and everything stays dry. There is not padding, but a light sweater would solve that, or a small dish towel (I always take a small pack towel with me to quickly wipe off splashes). The bag is NOT cheap. It IS very well made and will last you a life time.
If you don't mind "Camera inside" look--Lowepro Top Loader Zomm 75 AW with optional deluxe shoulder strap. Very well make and extremly versatile. Add a couple of lens pouches on each side if you need to.