I've been carrying a camping mirror in my backpack for a few years. When possible I would tie or hang it so I could see a trail behind me without turning around. I could sit more still that way and not be moving to look at the trail to my rear direction. I about died when I saw the Hunter's Mirror on the market. It's like a car mirror with a flexible shaft and a clip on the end for about $35. It sure outpriced my $2 mirror !