Which packaging innovation for religious texts was specifically developed in the 4th century CE to improve accessibility and usability over scrolls?

Throughout history, religious texts have been packaged in various ways to reflect their spiritual significance and ensure preservation. From ancient scrolls to modern digital formats, the packaging of sacred texts represents both practical solutions and symbolic meaning. This trivia question explores how religious institutions have embraced packaging innovations to make spiritual content more accessible while maintaining reverence for these important works.

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The codex format (book with pages)
Palm leaf manuscripts with protective lacquer coating
Illuminated manuscript cases with gemstone embellishments
Sealed clay vessels for Dead Sea Scroll preservation