Which packaging innovation, introduced by Penguin Books in the 1930s, revolutionized the publishing industry by making books more portable and affordable for mass consumption?

In the publishing world, book packaging innovations have transformed how readers interact with literature. From dust jackets to unique book shapes, publishers have constantly evolved their packaging to attract readers and enhance the reading experience. This poll tests your knowledge about a significant packaging innovation that revolutionized the paperback market and dramatically changed how people consumed literature.

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Standardized pocket-sized paperbacks with uniform colored covers
Leather-bound collector's editions with gold leaf embossing
Interactive pop-up book designs for adult literary fiction
Waterproof coated covers for beach reading