Which innovative retail packaging format, introduced in the 1910s, revolutionized grocery shopping by allowing customers to serve themselves rather than rely on clerks, eventually leading to the modern supermarket concept?

Product packaging has evolved dramatically throughout history, sometimes creating revolutionary changes in how we consume and interact with goods. Beyond mere protection, packaging innovations have shaped consumer behavior, extended product reach, and even influenced cultural norms. This trivia question explores one of the most transformative packaging developments that fundamentally altered a major industry and consumer habits worldwide in the early 20th century.

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The cardboard cereal box, pioneered by Kellogg's in 1915
The cellophane wrapper, which DuPont commercialized in the US in 1924
The pre-packaged grocery item with printed prices, first systematically implemented by Clarence Saunders at Piggly Wiggly in 1916
The tin can with easy-open lid, patented by the American Can Company in 1919