You produce three card castles from an empty paper bag.
Each Card Castle, made from miniature cards stands higher than the bag - over 11" high, and 7.5" at the base. It seems impossible for one castle to fit in the bag - you produce three! You could also use these "castles" for production from a book ( a book of Card Games ?), or any production prop of a reasonable size.

Supplied complete with the special printed laminated bag, 3 miniature card castles and instructions.