Dry, cool place where dust does not collect. Though not doujins, I know of some obsessive comic book collectors who plastic-sleeve everything and then put those into those paper filing boxes.

If you intend to flip through them often, your best bet is to invest in some clear plastic book jackets which will provide you with as much protection as you can get while still being able to open the book.

Though personally I don't really bother with that. I just remove the binding, scan, carefully replace the binding, and plastic sleeve+box in case I ever want to sell any of them.

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>>475
Thanks a lot, this is incredibly helpful.