How Do You Store Your Collection ?

I use CAPS Albums. A little on the pricey side, but the best.

I think I've figured out what Sap is talking about. It is best to store the album horizontally. So there is no plasticizer (here I did not understand) this gives a sheet and 2x2 reaction. In turn, the reaction of the plasticizer glues the sheet and 2x2. You will not be able to deliver your 2x2 from the sheet. And in turn, 2x2 can stick to the coin.
But why put albums on top of each other, why not vertically? Well , the leaves will sag and so what ?

It is. They are quite large as well. I am contemplating using them for my Innovation dollars and possibly a third Ike set.

I'll try my best, though it would be easier to show in a video.

It's generally impossible to keep a coin album "right way up" on a bookshelf, the same way you'd usually keep a normal book on a bookshelf, because the pages of a coin album full of coins are much heavier than pages in a normal book. So the pages will sag, and try to tear themselves away from the "top" rings of the album, ruining the pages. To avoid this problem, you really have only two possible solutions: Stack the albums flat, on top of each other, or balance them "sideways", with all the rings of the album at the top.

If either the 2x2 or the album page contains plasticizers - and it can be hard to tell - then you don't want to be keeping coin albums stacked on top of each other. Because if you've got a large stack of coin albums all sitting on top of each other, the weight of all the albums sitting on the top of the pile will "squeeze" down on the albums at the bottom of the pile, and under those pressures, any plasticizer in one or both of two dissimilar plastics will migrate between the plastics. Plasticizer migration usually causes either the album page or the film of the 2x2 (or both) to become "sticky", and you end up with a sticky mess that you'll want to throw away. Note that this doesn't usually affect or ruin the coins themselves, just the album pages and the 2x2 holders the coins are sitting in.Though of course a "sticky" 2x2 is more likely to get totally stuck if left in an album for too long, and the 2x2 is likely to tear apart the next time you try to take that coin out of the album.

This leaves only one optimal solution: putting the coin albums "sideways" on a bookshelf, with the rings at the top. This way, gravity is puling down on all the holes on an album page equally, and they don't sag (though may eventually weaken and tear, given enough time). And, because albums aren't being stacked on top of each other, there's no compression that might result in plasticizer transfer.

Getting a regular binder or coin album to stand up sideways isn't easy, as it doesn't have a square, solid base; you need to prop them up with bookends or other books. The safe-t-binders I linked to earlier are a rigid box, so they have a square base no matter which way you put them in a bookshelf, so they will "stand up sideways" all by themselves.

My thanks also Sap, that gives me more food for thought.