Which packaging innovation, invented in 1915, revolutionized retail by allowing customers to self-serve products for the first time, leading to the modern supermarket concept?

Product packaging has evolved dramatically throughout history, with certain innovations revolutionizing how we shop, preserve products, and experience brands. Some packaging inventions have been so transformative that they've changed entire industries and consumer behaviors. This trivia question focuses on a packaging breakthrough that fundamentally altered retail experiences and created new possibilities for product distribution, preservation, and marketing. Test your knowledge of retail packaging history with this challenging question!

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Cellophane wrap
Tin can with pull-tab
Tetrapak carton
Vacuum-sealed glass jar