Wacky Packages were packs of various cards that contained stickers of common household, food, and consumer products, that had a twisted slogan, name, message, etc. Like 'Crust' instead of Crest toothpaste for example!
Then to add to the fun, there were also gum and some bonus cards that contained a puzzle piece. There were many puzzles that could be made and you didn't always know which puzzle that piece belonged to. Each puzzle was a replica of one of the stickers!