Which of these retail innovations was originally created as a failed medical adhesive before becoming a revolutionary product?

Many of today's most revolutionary product innovations weren't originally designed for their eventual use. Some inventions that transformed retail and consumer behavior were discovered by accident or were intended for completely different purposes. This trivia question explores one such famous accidental discovery that revolutionized retail operations and product packaging worldwide.

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Post-it Notes (The adhesive was initially criticized for not being sticky enough)
Bubble Wrap (Initially designed as textured wallpaper before becoming packaging material)
Velcro (Developed after a hunting trip when burrs stuck to the inventor's clothing)
Scotch Tape (Created when trying to develop waterproof material for automobile painting)