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As for hanging reflective strips from my stashed food pack ... if it makes it easier for ME to find it in the dark, doesn't it serve the same purpose for a curious bear?

I was thinking the same thing? I suppose if the strips only illuminated when a flashlight was on them, then I don't think it would attract a curios bears attention :-/

Some reflective materials, like those neon type plastic baits your charge with a flashlight, give a glow for hours. I'm pretty sure that's not what you want on a food pack. Black bears are smarter than dogs and as curious as a cat.

The flashing light would be okay on the "bear alarm", but unless a bear is deaf or senile, I can't see how it could tolerate the noise, never mind a flashing light.  You find a bear that can, it must be a throwback to the 60's 8-)