Here's another wrinkle, what about carrying redundant multi-taskers? If I had two Blackberry Pearls, I would have doubled my entire edc electronics functionality. What are the odds both would fail entirely? How about two Leatherman Wave multi-tools? Or two of those hand cranked LED flashlight/radio/siren/batt chargers?

Things that make you go "Hmmmm...".
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)