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Message:: [QUOTE="Just Carl, post: 116001, member: 4552"]The question about the difference in the 1x1, 1 1/2 x1 1/2, 2x2. Not just the size, but the cost naturally. I don't like the smaller than 2x2's though. I like a little room around the coin inside. You don't have to staple you know. They can be closed with tape. It takes longer but seals better. Easier to open with a small knofe blade. I had a bad experience opening a stapled 2x2. I used a screw driver on a MS64 Lincoln Cent dated 21S. The stupid screw driver slipped and ran accross the coin. Now it's tape.   Naturally all PVC's contains Vinyl. PVC stands for Poly Vinyl Chloride. Note however, that although all PVC's are plastics, not all plastics are PVC's. Sort of like all Chevy's are cars but not all cars are Chevy's. Since this is not a chem class, I won't elaborate further. Can be verified in a book written by some guy named Webster.    As to storage, All my extra coins are put into 2x2's, Then the 2x2's are put into these long, cardboard boxes I purchased at coin shows that hold a few hundred 2x2's. This is then put into a large freezer type plastic bag and taped shut. No problems in the last 50+ years. If there is any bad reactions to this system in the next hundred years, I'll let you all know.[/QUOTE]