Which packaging innovation of the 1990s most dramatically increased the portability and distribution of religious texts in developing countries?

Religious texts and philosophical works have evolved not just in content but in their physical presentation. Throughout history, innovations in packaging and presentation of sacred texts have reflected both technological advancements and changing relationships between people and their spiritual materials. This trivia question explores a significant modern packaging innovation that revolutionized accessibility to religious texts.

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Thin-paper technology allowing complete religious texts to be printed at 1/10th the previous weight
Vacuum-sealed waterproof packaging that protected texts in humid climates
Solar-powered electronic text readers with pre-loaded religious content
Single-signature binding with weatherproof covers allowing economical mass-production of scripture portions