I'm on the search for a bit of a dream product. Essentially, I'm looking for a sling bag that I can modify to function as a camera strap a la RapidStrap. For this, it would need to be left-handed (over the left shoulder, under the right arm) so that I could sew on an additional strap that my clip (that holds the D-ring that's fastened to the camera) can ride on... oh, and it would be reasonably small - I want a walk-around - camera and lens on the strap, an additional lens and a few accessories in the bag... Anything like this exist?

