In Japan, soft drink manufacturers often use on-pack omake ("freebies") to promote repeat sales. Not too long ago, canned coffee maker UCC tied up with All Nippon Airways to release a series of mini figurines that showcased the evolution of uniforms worn by the airline's flight attendants (click photo for larger view). Between 1955 and 2005, ANA changed its uniforms nine times, so UCC created nine figurines for consumers to collect.
For an example of an on-pack promo executed by Coca Cola Japan's Georgia canned coffee, check out this earlier post.