Which innovative packaging development in the 1910s-1920s fundamentally changed retail by allowing consumers to self-serve products instead of relying on clerks to measure and package goods?

Throughout history, product packaging has evolved dramatically, not just as a container but as a marketing tool. From ancient vessels to modern sustainable solutions, packaging tells the story of technological advancement, cultural shifts, and consumer expectations. This trivia question focuses on a pivotal moment in packaging history that revolutionized retail and consumer behavior in the early 20th century.

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Cellophane transparent wrapping
Tin cans with pull-tab openings
Corrugated cardboard shipping boxes
Aluminum foil food wrapping