Which packaging innovation for religious texts in the 20th century dramatically increased accessibility and is credited with distributing over 5 billion copies worldwide?

Throughout history, religious texts have undergone fascinating transformations in how they're packaged, presented, and distributed to believers. From ancient scrolls to digital apps, packaging design in religious publishing has balanced tradition with innovation. This poll tests your knowledge of how sacred texts have been presented to the faithful across different eras and traditions. Can you identify the groundbreaking packaging innovation that revolutionized accessibility to religious texts in the 20th century?

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The Gideon Bible's compact hotel room format
Gold-leaf embossed family heirloom editions with genealogy pages
Interlinear translations with original language and vernacular side-by-side
Leather-bound pocket editions with magnetic clasps