You are right, breathing isn't an issue. Rot, mold, and fungus are. You don't want to store anything with a high moisture content in plastic. Pollen, seed, etc. should be dry before long-term storage.
Take a coffee filter or a piece of copy paper and write your info on it. Draw a little circle, and place the pollen in that circle (so you can find it later). Fold it loosely and stick it on a shelf for a week or so, in still dry air. At that point it's probably safe to store in a plastic bag in the fridge.
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