For some riders, a rear view mirror is indispensable. There is no question that knowing what’s coming up from behind is a good idea, it’s just a matter of how one decides to keep tabs on things. Rear view mirrors that mount to glasses are nothing new, and the Messenger Mirror doesn’t claim to be. It does claim to be a compact, high quality glass mirror with a simple, DIY attachment and a $5 price tag. Easy-on, easy-off and adaptable to right or left side use depending on how traffic flows where you live, this mirror is sure to find a few fans out there.