Which iconic album was the first to feature a working zipper as part of its packaging design?

The music industry has seen numerous innovations in album packaging design that have become as legendary as the music itself. Some album covers and packaging concepts have transformed how we experience music, creating memorable tactile and visual experiences that complement the audio journey. This poll tests your knowledge about a groundbreaking packaging design that changed how albums were presented to consumers and influenced generations of album art that followed.

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The Rolling Stones' 'Sticky Fingers' (1971)
Led Zeppelin's 'Physical Graffiti' (1975)
The Velvet Underground & Nico's debut album (1967)
Pink Floyd's 'The Dark Side of the Moon' (1973)