Which packaging innovation, first commercially successful in the 1910s, was originally developed for military use but revolutionized food preservation and retail after World War I?

Product packaging has evolved dramatically throughout history, often reflecting societal changes and technological innovations. Some packaging inventions revolutionized entire industries and changed consumer behavior forever. This trivia question focuses on a pivotal moment in packaging history that transformed product preservation and distribution in the early 20th century.

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Tin cans with key openers
Vacuum-sealed glass jars
Cellophane transparent wrapping
Cardboard milk cartons