Which packaging innovation from the 15th century most dramatically increased access to religious texts in Western Europe?

Throughout history, religious texts have undergone fascinating packaging and presentation innovations to preserve their sanctity while increasing accessibility. From ancient scrolls to modern digital formats, the physical presentation of sacred texts reveals much about the values and technologies of each era. This poll explores a significant packaging innovation that transformed how religious texts were distributed and engaged with by believers.

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Gutenberg's movable-type printing press, enabling mass production of affordable Bibles
Introduction of leather-bound codices with gold embossing for elite households
Development of illuminated manuscripts with protective wooden covers
Creation of portable pocket-sized prayer books with ribbon bookmarks