You think you’re getting exactly what you ordered on Amazon—but that’s not always the case.

You may not realize that the item you’re buying on Amazon might not actually come from the seller listed on the product page. In fact, Amazon uses a system that allows products from different third-party sellers to get tossed into the same inventory pile—regardless of who you clicked “Buy” from. It’s called “commingling,” and it’s one of those behind-the-scenes things we wish more people knew about. So here’s what that means for your next purchase (and why it might not be what you think you’re getting).

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