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These are increasingly more desirable. Some investors opt to proudly display their coins in archival folders, while others like air-tight capsules, or mylar-lined 2x2's. Whatever you choose, do not store yours in the PVC flips you often find on the marketplace. They are made from PVC which decomposes over time and ruins the coin it was intended to protect. If you buy a coin already in such a sleeve, transfer it as soon as possible to something better. You may consider acetate flips, but understand that these are brittle and might scuff the coin if isn't inserted and taken out with care. While they aren't airtight, they're reasonable choices for moderate priced coins that will be "left alone" for numerous a long time.
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