Which packaging innovation did DVD manufacturers introduce in the early 2000s that significantly changed how consumers browsed film titles in retail stores?

Throughout film history, the way movies are packaged and presented to consumers has dramatically evolved. From VHS clamshells to streaming thumbnails, packaging design plays a crucial role in how audiences discover and interact with film content. This trivia question explores an interesting chapter in how movie packaging influenced consumer behavior and industry practices during a significant transition period in home entertainment.

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The clear plastic 'keep case' that allowed cover art to be visible from both sides of the package
The 'snapper case' with cardboard outer sleeve that featured expanded plot summaries
The 'digipak' design that included a built-in viewer for previewing film clips
The 'eco-box' that reduced plastic by 30% and featured QR codes linking to trailers