If you already carry a cell phone on rides, how about switching to one with a camera built into it?

I carry a cell phone for emergencies, I use this phone inside a waterproof case (ibike) as my (mulit function) bike computer, GPS and on occasion I take pictures and videos with it.

One device with 4 bike ride uses. It's an iPhone and it has lots more uses in other parts of my life. I keep it fully backed up on my computer just in case I loose it, I can pick up a replacement and reload it with all my data within minutes.