Which packaging innovation, first introduced in the 1910s, revolutionized food preservation and was initially called the 'tin can with a key'?

Throughout history, product packaging has evolved dramatically, not just as a functional container but as a strategic marketing tool. From simple paper wrappings to sophisticated designs, packaging has reflected cultural shifts, technological advancements, and changing consumer preferences. This trivia question explores a pivotal moment in packaging history that revolutionized how products were presented and preserved in the early 20th century.

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Gable-top milk carton
Flip-top cigarette box
Sardine can with attached key-wind opener
Mason jar with screw-top lid