Which packaging innovation of the 20th century most significantly increased the global distribution and accessibility of religious texts?

Throughout history, religious texts have been among humanity's most cherished written works, requiring specialized packaging to preserve their sanctity and durability. From ancient scrolls to modern digital formats, the packaging of sacred texts reflects both technological innovation and deep reverence. This trivia question explores a fascinating innovation in religious text packaging that revolutionized accessibility and preservation in the modern era.

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The introduction of lightweight vinyl Bible covers with zipper protection
The development of acid-free, thin paper (often called 'Bible paper') allowing compact yet complete volumes
The creation of waterproof synthetic covers for missionary work in tropical regions
The implementation of gold-leaf embossing techniques for luxury ceremonial editions