Which revolutionary packaging innovation, introduced in the 1980s, made vital medications significantly more accessible in developing countries by solving the 'last mile' preservation problem?

Product packaging isn't just about protection or aesthetics—it's a realm of incredible innovation that has transformed how we consume products. Some packaging breakthroughs have been so revolutionary they created entirely new markets or saved millions of lives. This trivia challenges you to identify one of the most significant packaging innovations in history that dramatically expanded access to essential medication in developing countries.

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

The Vaccine Vial Monitor (VVM) - a heat-sensitive label that changes color when a vaccine has been exposed to too much heat
The Blister Pack - individual sealed compartments that extend medication shelf life in humid environments
The UniPack - a solar-powered miniature refrigeration system built into medication containers
The ThermoStable Coating - a polymer film that maintains stable internal temperature despite external conditions