Which packaging innovation holds the Guinness World Record for 'Most Personalized Consumer Product Campaign' that dramatically increased customer retention?

The world of retail is filled with astonishing achievements that have earned places in the record books. From packaging innovations that changed consumer behavior to promotional campaigns that shattered expectations, global retailers continue to push boundaries. This trivia question focuses on a remarkable packaging innovation that broke world records and revolutionized consumer engagement. Test your knowledge of retail milestones that have made history!

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Coca-Cola's 'Share a Coke' campaign with personalized name labels on bottles
Amazon's frustration-free packaging with individualized QR codes
Apple's personalized engraving service for electronic devices
Nutella's unique label generator allowing custom jar designs