Plastic folders preorder bonus?
What exactly are these plastic folders I sometimes get when I preorder Japanese albums? I got one for preordering the Lament of Innocence and Curse of Darkness soundtracks together from CD Japan, and I recently got one for buying the new Studio Ghibli Songs album. These things are made out of durable plastic and have good-looking illustrations on them, but I honestly have no idea what they are used for.
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