Which packaging innovation introduced in the 1920s revolutionized food preservation and was initially advertised with the slogan 'Keeps Food Fresh Forever'?

The packaging industry has evolved dramatically throughout history, with innovations that have changed how products are preserved, transported, and marketed. Many packaging developments we take for granted today were revolutionary when first introduced. This trivia question focuses on a significant packaging innovation that transformed product preservation and consumer habits in the early 20th century, setting the stage for modern retail and consumer culture.

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Cellophane transparent wrapping
Aluminum beverage can
Tetrapak carton
Aerosol spray can