Which product packaging innovation of the 1450s-60s revolutionized access to religious texts and is credited with helping spark the Protestant Reformation?

Throughout history, religious texts have been revered not just for their content, but also for how they're packaged and presented. From ancient scrolls to modern digital formats, the packaging of sacred texts reflects both technological capabilities and theological priorities. This trivia question explores an innovative product packaging development that changed how believers interact with their sacred texts.

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Gutenberg's movable-type printed Bible with standardized binding
Illuminated manuscript covers with precious metal clasps
Scroll storage tubes with humidity control mechanisms
Leather-bound codices with indexed page markers