I you remember from Colin Fletchers "The Man Who Walked Through Time," he tried both a signal mirror and a bright orange jacket to attact attention for his food drop on that hike. Neither worked worth a damn. they finally saw his cheapie blue tarp.

Bear in mind that in the red rocks of the Grand Canyon, and orange jacket is going to look like everything else.

But they never saw the mirror.

We take one, so M can carefully apply sunscreen to her lovely face.