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The act of taking a person's backpack and removing all of the contents, flipping the backpack inside out, placing the contents back inside of the inside out backpack and zipping it shut. The result of this action can only be achieved when a person has stolen the backpack without the owner noticing. The inside-out backpack resembles a turtle, because it looks like a shell and it is hard to unpack. It is looked down upon to have a backpack that is "unturtlable."
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