Which innovative product packaging feature has significantly contributed to the resurgence of vinyl records in the digital streaming era?

The music industry has seen a fascinating trend in recent years with the revival of vinyl records. Despite the dominance of digital streaming platforms, physical music products—particularly vinyl—have made a remarkable comeback. This trivia question explores an interesting aspect of product packaging in the modern music industry that has contributed to vinyl's renewed appeal among consumers and collectors alike.

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QR codes on record sleeves that unlock exclusive digital content
Heavyweight 180g vinyl pressings with enhanced audio quality
Biodegradable shrink wrap made from plant-based materials
NFC chips embedded in album covers for augmented reality experiences