I don't really like camera bags so I was surprised when I worked out that I owned about ten of them.
They get used to keep things in at home but when I go out I usually carry the camera without a bag as I used to end up with the camera in my hand and carrying an empty bag.
My one exception to this is a small canvas bag for which I made a polystyrene and cardboard insert to carry my Minolta XE-1 and three lenses. The best thing about it is that it doesn't look anything like a camera bag (and it cost about £4).
It was my intention to make other inserts for other cameras but I have not done this yet.