Which religious product's packaging innovation in the 1940s-50s fundamentally changed how people accessed sacred texts and sparked debate about the 'democratization' of religious knowledge?

Throughout history, religious items have been packaged and presented in ways that reflect their sacred nature. From ornate Bible covers to specially designed prayer mats, the packaging of spiritual products often carries deep symbolic meaning. This trivia question explores a fascinating aspect of how one major religious product's packaging changed history and sparked philosophical debate.

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Pocket-sized Gideon Bibles with synthetic leather covers
Mass-market paperback editions of the Bible by Penguin and other publishers
Factory-sealed kosher food with tamper-evident packaging
Pre-packaged communion wafers and wine sets for home worship