Which packaging innovation was first introduced specifically for religious texts before becoming widespread in other book publishing?

Religious texts have been among the most produced and distributed products in human history, with fascinating innovations in their packaging, production, and distribution. Publishing houses specializing in religious texts have pioneered numerous techniques that later became standard in the wider publishing industry. Test your knowledge about the innovative product packaging strategies that have shaped how sacred texts reach believers around the world.

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The leather-bound, ultra-thin 'India paper' format that allowed complete sacred texts to be carried in a pocket
Dust jackets with promotional text and author biographies
Hardcover with dust jacket packaging for premium pricing
Color-coded tabs for navigation between sections