Or the Chris response:
Don't edc what you don't need. Find a suitable stone or cobble, or a ceramic coffee mug, or an emery board, or a nail file. There's bound to be something nearby that will serve to touch up your Knife edge enough to keep you going. Be practical.
As for me, I tote one of them there $4 tungsten carbide sharpeners like what wildman uses, when I think I will need to. Then when I get the chance, I will put the edge to the wheel at home and polish it back to plumb.
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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)