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Wacky Packages were stickers made by Topps in the 1970's. They contained spoofs of commercial products that - in retrospect - weren't very imaginative (Quacker Oats..?) - but were HI-LARIOUS when I was nine.
These things were huge - kids stuck them everywhere. And Topps deliberately staggered the way they were released so that it cost a small fortune to "collect 'em all". (I was up to my ass in "Weakies", but never was able to get "Band-Ache").
According to the site, Topps has been making new cards since 2004. Who knew?