Which packaging innovation from the 1910s-1920s is credited with revolutionizing retail by introducing the concept of 'self-service' shopping where customers could see products before purchase?

Throughout history, product packaging has evolved dramatically, influencing consumer behavior and brand identity. One particular packaging innovation in the early 20th century revolutionized retail by fundamentally changing how products were presented, preserved, and marketed to consumers. This advancement shaped modern packaging principles we still use today. Test your knowledge of this transformative period in retail history!

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Cellophane transparent wrapping (allowing consumers to see products without opening packages)
Tin cans with lithographed labels (introducing consistent brand imagery)
Cardboard boxes with die-cut windows (combining protection with visibility)
Vacuum-sealed containers (extending product shelf life)