I always wondered this. My thinking was "they can only absorb so much oxygen, and they'll probably do that long before being crimped onto a beer". Learn something new every day.As long as they are kept dry, I should think for quite a while. They are activated by getting wet.
Be sure to put them in sanitizer before use.
Sorry WBC but this is incorrect Forrest at AHBS posted earlier here this year not to do this. Just use them right out of the bag.
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