Hallmark published a line of Muppet postalettes -- cards that fold up and are sealed with a sticker, and can be mailed without an envelope. The box packaging promises, "With Postalettes you can have the warmth of a letter with the ease of a postcard."

Two sets were released in 1981 -- a Pigs in Space set, and a picnic-themed set. A Christmas set, decorated with a photo of Kermit the Frog as Santa Claus, followed in 1982.

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