Which book packaging innovation of the 1930s dramatically increased accessibility to literature and was specifically designed to fit in soldiers' pockets during WWII?

Throughout history, book packaging and presentation has evolved dramatically, influencing reader psychology and sales. From ancient scrolls to modern digital formats, the way literature is packaged reflects both technological capabilities and cultural values. This poll tests your knowledge about an innovative packaging technique that revolutionized the accessibility of literature in the 20th century and continues to influence consumer behavior in the arts and literature market.

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Paperback books (Pocket Books)
Dust jacket with flaps
Leather-bound collector editions
Hardcover with library binding