The 2 mph average "exploration" ride

[SadieKate]

That's a good point. I may start doing that as a head lamp backup. I already carry waterproof matches, a small first aid kit and extra food. But I think I'll throw a space blanket as well.

I am extremely happy to say I've worn out a lot of space blankets simply through many years of stuff bouncing on top of them in my pack.

Ha, while typing this I had an epiphany -- make a space blanket case out of a section of old inner tube. Will have to test out the diameter.