I've got a micro four thirds camera (Olympus OM-D E-M5) with a bunch of lenses. Like many camera owners, I have several camera bags. Most of these are large enough to carry the camera and several lenses, along with accessories. What I was looking for, was something smaller and light if I just wanted to carry the camera with one lens attached, and maybe another small lens as well. I really dislike bags that look like camera bags.
Crumpler makes a series of camera inserts you can use with any bag. Their Haven line comes in small, medium, and large. I found the small Haven fits perfectly in a medium cafe bag:
Voila: a small bag that doesn't scream "camera bag." The cafe bag's front and back pockets can be used for wallet, phone, etc; leaving the main pocket for the insert.