Which packaging innovation led to a documented 20% increase in household consumption of its product by solving the 'pouring problem' that had previously limited usage?

Packaging innovations have dramatically influenced consumer psychology and purchasing decisions over the decades. Sometimes, a single packaging breakthrough can transform an entire industry, changing how products are consumed and marketed. This trivia question focuses on a revolutionary packaging innovation that significantly altered consumer behavior and created new market opportunities. Test your knowledge of how product packaging has shaped business economics and consumer habits!

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The resealable zipper on cheese packaging
The flip-top cap on ketchup bottles
The pull-tab on aluminum beverage cans
The pump dispenser on liquid soap bottles