Which packaging innovation was first widely used for mass distribution of the Bible in the early 20th century, making it more affordable and portable for everyday believers?

Throughout history, sacred texts have not only been revered for their content but also for their presentation. The physical packaging and design of religious texts have evolved significantly over centuries, often reflecting both technological innovations and cultural values. This trivia question explores a fascinating aspect of how religious products have been packaged and presented to believers across different eras.

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Leather-bound pocket editions
Vinyl covers with gold embossing
Paperback formats with glued bindings
Scroll cases with protective cylinders