Which innovative product packaging development in the 15th century revolutionized access to religious texts and contributed significantly to the Protestant Reformation?

Throughout history, religious texts have been considered some of the most valuable objects in human civilization. The physical packaging and preservation of these sacred writings reveals fascinating insights about cultural values, technological innovation, and the intersection of spirituality with material culture. This trivia question explores an interesting development in the packaging and presentation of religious texts that revolutionized accessibility.

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Gutenberg's movable-type printing press and mass-produced bound Bibles
Illuminated manuscripts with gold-leaf packaging by monastic artisans
Scroll cases with humidity control systems from the Byzantine Empire
Waterproof papyrus containers developed by Egyptian priests