Lens bag for 4002.8 with hood and camera

Hi,

I am looking for a bag which can take my 400 f2.8 IS with hood attached and body attached, so that I dont lose time in attaching the hood and shooting. The dust in the National Parks in India is immense.

At the moment my Lowepro Computrekker can take the 400 f2.8 with body attached, but hood reversed.It is a very tight fit. It takes precious time to take this out, arrange the hood in shooting position, put the bean bag in position. I use the Gitzo with Wimberley when there is more time. I have got a camouflage cloth stitched and was carrying my camera+400f2.8 with hood attached so that I am ready for shooting. But I had to carry it in my lap like a baby all the time. You will agree that it solved my dust problem, but the bumpy ride made it pretty hard for me. Since I am using the replacement foot for the lens, its sharp edges ensured some painful moments. Apart from this, I am worried about the impact of bumpy rides on the camera mount. After three weeks of Safari iin heat, dust, rain and hailstorms, I have decided to seek suggestions from you all.

Thanks in advance.