Which innovative packaging design feature was first introduced specifically for Bibles in the 20th century that revolutionized how people could interact with religious texts?

Throughout history, religious texts have been among the most carefully packaged products in human civilization. From ancient scrolls to modern editions, publishers of sacred texts have developed distinctive packaging approaches that balance reverence, practicality, and cultural significance. This poll explores how different religious traditions have approached the packaging design of their most sacred texts in the modern retail environment.

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Red-letter editions (printing Jesus's words in red)
Leather thumb-indexed tabs for quickly finding specific books
Gilded page edges with protective coating
Waterproof synthetic covers for missionary work