Which packaging innovation for religious texts was specifically created to address the needs of traveling missionaries in the 19th century?

Throughout history, religious texts and spiritual teachings have been 'packaged' in various ways to reach believers. From ancient scrolls to modern digital formats, the presentation of sacred wisdom has evolved dramatically while preserving core messages. This trivia question explores how religious organizations have adapted their 'product packaging' to maintain relevance across generations while honoring tradition.

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The 'missionary binding' - ultra-thin pages bound in flexible leather with rounded corners designed to withstand harsh travel conditions
The 'pulpit edition' - oversized volumes with gold leaf pages and metal corner protectors for ceremonial display
The 'pocket devotional' - miniaturized scriptures with magnifying glass inserts for daily personal reading
The 'comparative text' - multi-column layouts showing different translations side by side for scholarly analysis