You would need to heat seal in a Mylar bag for O2 absorbers to be effective.
I get my O2 absorbers and large mylar bags that fit a 5 gallon bucket from our local WINCO store.. One bag for everything and a few oxygen absorbers couldn't hurt....Sealing them up might also help with high humidity summers. Just use your fancy electric hair straightening press to seal them after you suck out the air with a vacuum cleaner.I'm figuring that the factory packaging (yes, they come from a food factory) is barely air tight, if air tight at all. Thus my reasoning for considering oxygen absorbers.
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