Which packaging innovation was first introduced for mass-produced Bibles in the early 20th century that revolutionized their accessibility and portability?

Throughout history, religious texts have not just been vessels of spiritual wisdom but also products that evolved in their packaging and presentation. From ancient scrolls to modern digital formats, the way sacred texts have been packaged and presented to believers has changed dramatically with technological and cultural shifts. This poll tests your knowledge about how religious publishing has evolved as both a spiritual and commercial enterprise.

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India paper (ultra-thin paper that allowed complete Bibles to be much smaller and lighter)
Leatherette covers with gold embossing (synthetic material that mimicked expensive leather)
Color-coded verse highlighting system (to easily identify themes and topics)
Thumb indexes (cut-out tabs on page edges for quickly finding specific books)