Throughout its history, Pringles used its print and television advertising campaigns to compare their products to conventional potato chips. In its early years, they were marketed as "Pringles Newfangled Potato Chips" and had a small silver pop-top to open the can. Unlike the current advertising, they only mentioned that, with their pop-top cans (which have been replaced with foil tops since the late 1980s), their chips remain fresh and unbroken, the can holds as many chips as a typical large bag, and their curvy shape allows them to be stackable; thus inspiring the slogan, "Other potato chips just don't stack up."