Well I really like a Simulac bag I got at a yard sale it's big enough for my Koni Omega has a zipper on top for the main compartment and two side and two end compartments shoulder and hand carry straps. Well made and cheap and easy to find used around here: they must be given away with with Simulac forumula or something. and the one I have while it does not look like a camera bag and has a teddy bear name tag on it is black and not thatbad looking. Other wise over the years I have used everything from plasic grocery bags to old ugly bags bought at secound hand stores. I have a ugly brown bag that came with a Foldex 20 camera I just bought that would likely work for you it sure does not look like today's camera bags.
Jay