Which packaging innovation in the 1960s-70s significantly impacted the distribution and accessibility of religious texts across multiple faith traditions?

Throughout history, religious texts have undergone significant changes in how they're produced, packaged, and distributed to believers. From ancient scrolls to digital apps, the packaging of sacred writings reflects both technological advances and changing spiritual practices. This trivia question explores an innovative packaging development that revolutionized accessibility to religious texts in the modern era.

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Introduction of mass-market paperback religious texts with distinctive color-coded covers for different faiths
Development of vacuum-sealed scripture preservation sleeves for ancient manuscripts
Introduction of illuminated plastic covers that glowed in the dark for nighttime reading
Creation of scented book bindings designed to enhance meditation experiences