Which packaging innovation was accidentally discovered in 1968 when a scientist at 3M was trying to develop a super-strong adhesive but instead created a 'low-tack' reusable adhesive?

In the world of inventions and discoveries, product packaging has evolved dramatically over the decades. Some packaging innovations have completely transformed how we interact with everyday products, creating new consumer behaviors and solving longstanding problems. This question focuses on a groundbreaking packaging discovery that revolutionized an entire industry and became ubiquitous in modern households. Test your knowledge of transformative product packaging innovations!

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Post-it Notes
Bubble Wrap (originally intended as textured wallpaper)
Resealable Zip-Lock Bags
Peel-off Tamper-Evident Seals