Could be, I have packets that are over two years old in there, still good to go. Mustard doesn't do so well, it tends to turn brown. Probably because it's only in plastic and not foil, although the Gulden's packs I get from Panera's should hold out longer.

Sounds like the start of a new thread to me...
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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)