sentences:  Three single Stackers had 50% more cheese and double the bacon of one triple Stacker.The BK Stackers are a family of hamburgers, consisting of one to four hamburger patties, bacon, American cheese and the King Sauce used on the Big King served on a sesame-seed bun.The BK Stacker was introduced using commercials that employed groups of little people in the roles of members of the "Stackers Union".