The Messenger Mirror is the most compact safety device you can get. For under $6.00 you can get a handmade mirror that’ll fit on your glasses or frame. The mirror itself is teeny–smaller than a dime–and it could save your life.
We’re not sure that a lot of actual messengers will pick it up as I’ve noticed that most messengers opt for style over safety, but it’s certainly a good deal for the commuter.