Backpack Camera Case

Backpack Camera Case
Where can I find a slim fitting (maybe neoprene) case for a bulkier Canon Powershot Sx20is Digital Camera?

I know the camera is bigger & bulky camera but ideally I want a Neoprene Case that zip snug around it. I would like to put the camera inside my purse and not have a separate backpack like case.

I bought one for this camera in walmart that fit just perfectly around the camera.

Case Logic Slr Camera/Laptop Backpack