Which packaging innovation of the 1960s dramatically increased the accessibility and distribution of religious texts worldwide?

Throughout history, religious texts have evolved not just in content but also in their physical presentation. From ancient scrolls to modern digital formats, the packaging and presentation of sacred writings reflect technological advances, cultural shifts, and changing devotional practices. This trivia question explores an innovative packaging development that revolutionized access to religious texts in the modern era.

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Paperback Bible with synthetic covers that reduced production costs by over 60%
Spiral-bound prayer books with detachable pages for seasonal worship
Waterproof scripture covers made from early lamination techniques
Audio cassette recordings of religious texts with synchronized page-turning signals