The best thing is not to put your cams into a camera bag. The reason sooner or later, people will realise that you are carrying a camera.
Like when I was on my 7 week vacation, I brought along a backpack and it was slung with the top of the bag facing front. Two reasons. The first being that it prevents people from stealing my stuff and second, a little easier to change lenses. The main reason nobody knows that you are carrying a camera equipment.
However, the drawback is that your stuff might get scratched. That is the only bad part.