You should try a bag from http://cloakbags.com


I just bought one and it works perfect. Small and totally discreet. You don't even need to take the camera out of the bag to take pictures. Unreal that nobody thought of this before now. I don't know if it will fit your camera or not but you should check it out because it is an "adjustable" size bag - - you can actually change the length depending on what lens you have on your camera.