Amazon-I just bought a couple of mixed size sets.

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For me, I like to zip, flip inside out, then put it in a laundry bag-I’ve had zippers come open during washing & snag other clothes/catch on a button hole or something.

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Yep, this is my big thing with almost all laundry items, but especially things that are prone to pilling-it helps prevent lint buildup on the pulled spots so they look much better.

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