Which packaging innovation in the mid-20th century dramatically increased accessibility to religious texts across multiple faiths?

Religious texts are not just spiritual guides but also products that have evolved in their packaging and presentation over centuries. From ancient scrolls to modern digital formats, the way sacred texts are packaged reflects both technological advancement and changing relationships between believers and their texts. This poll explores an interesting fact about a packaging innovation that revolutionized religious text accessibility in the 20th century.

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The introduction of mass-produced leatherette covers with gold leaf lettering
The development of pocket-sized religious texts with thin, lightweight pages
The creation of hardcover books with built-in ribbon bookmarks
The advent of spiral-bound devotionals with weather-resistant covers