Which innovative CD packaging format, introduced in the early 2000s, was marketed as environmentally friendly but was criticized for scratching discs and difficult opening?

The music industry has seen dramatic changes in how physical albums are packaged and presented to consumers over the decades. From elaborate vinyl gatefolds to minimalist streaming thumbnails, album packaging has evolved with technology and consumer preferences. This trivia question focuses on an innovative packaging technique that changed how consumers interacted with physical music products in the early 2000s.

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DualDisc format
DigiPak cardboard sleeves
CD Longbox packaging
CD in paperboard sleeve (a.k.a. 'ECO-pak' or 'PaperSleeve')