Which WWII military product design innovation later revolutionized civilian retail through its material technology?

Throughout military history, certain product innovations have dramatically altered warfare tactics and strategy. These design breakthroughs often began as specialized military equipment before finding their way into civilian markets. This poll explores one such revolutionary product design that changed both battlefield dynamics and eventually influenced consumer products we use today. Test your knowledge of military product design evolution!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Duct tape (originally called 'duck tape'), designed as a waterproof sealing tape for ammunition cases
Polarized sunglasses, developed to help pilots see through glare and better identify enemy aircraft
Jerrican fuel containers, designed for efficient fuel transport and distribution in field operations
Pressurized ballpoint pens, created to allow pilots to write at high altitudes where fountain pens would leak