A ship in a bottle is the most familiar example, but enthusiasts have come up with plenty of other stuff—(even packaged stuff like cigarette packs and decks of playing cards)—to put into their “impossible” bottles.
The photo of the Coke bottle with the Rubik’s cube is from The Impossible Bottle Website; I don’t remember where I found the photo of the Coke bottle with the wooden arrow, but it’s interesting since an earlier Coca-Cola bottle featured a prominent embossed arrow. (See Inset on right)
(See also: Packaging Puzzles)
Beach Packaging Design