An old worn brown envelope covered in notes, one says 'buy a new envelope you tight get'
https://assets.merveilles.town/media_attachments/files/107/551/967/378/113/202/original/9fe155d56f156571.jpeg
My in-laws have been exchanging Christmas cards with another couple using the same envelope for over 30 years. It goes one way one year, then back the next.
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