Which packaging innovation for religious texts was first widely introduced by Oxford University Press in the 1880s and revolutionized how people carried their Bibles?

Throughout history, religious texts have been packaged and presented in various ways that reflect their sacred nature. From ancient scrolls to modern digital formats, the packaging of religious texts has evolved while maintaining symbolic significance. This trivia question explores an interesting fact about the packaging of one of the world's most influential religious texts and how it relates to consumer traditions.

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India paper Bibles (ultra-thin paper that allowed for compact yet readable religious texts)
Leather zip-around covers with built-in bookmarks and note sections
The first waterproof Bible covers made from treated canvas
Thumb-indexed edge cuts allowing quick navigation to different books