Which revolutionary book packaging format was introduced in 1935 by Penguin Books that made literature more affordable and accessible to the mass market?

Product packaging in the publishing world has evolved dramatically over centuries, with innovations that have changed how we interact with literature. From materials to design elements, publishers have used packaging to attract readers, protect content, and enhance the reading experience. This poll tests your knowledge about a revolutionary book packaging innovation that transformed the accessibility of literature for millions of readers worldwide.

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Paperback books with standardized cover designs
Leather-bound editions with gilt-edged pages
Hardcover books with removable dust jackets
Spiral-bound books with illustrated covers