Which religious product innovation first introduced the concept of 'pocket-sized' sacred texts that revolutionized personal devotion practices in the early 20th century?

Throughout history, religious products have evolved in their packaging and presentation to meet changing spiritual needs and cultural contexts. From ancient religious texts to modern meditation apps, the way faith-based products are packaged and delivered has transformed dramatically. This trivia question explores an innovative packaging development that changed how people access religious content in the modern age.

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The Gideon Bible program, which placed compact Bibles in hotel rooms worldwide
The Oxford University Press 'India Paper' Bible, which created ultra-thin yet opaque pages for portable religious texts
The Jerusalem Stone USB drive containing digital versions of sacred texts
The Vatican's miniaturized prayer book series with magnifying glass included in the binding