Keep case

A keep case or poly-box is a type of packaging, most commonly used with DVDs (and sometimes CDs).

Besides DVD-Video films, keep cases are very common with most video games since the PlayStation 2 as well as PC titles and MP3-CD audiobooks all use discs that are the same basic dimensions as a DVD.

The first products to be released in keep cases were VHS tapes, though most were stored in less expensive pressboard sleeves. In the days before video games were released on optical media, cartridges would rarely come packaged in specially designed plastic keep cases with lugs inside to hold the instruction manual, as opposed to pressboard boxes. Cartridges and cards for the Sega Master System platform were the first video games to be packaged in any kind of keep case. The vast majority of Sega Genesis games would come in a plastic keep case (roughly the size of a VHS case), but were later packaged in pressboard boxes, as a cost-cutting measure. Before the standard, commonly used DVD case was invented, early CD-ROM based video games such as Sega CD and early PlayStation titles, would often come in thicker and taller jewel case. These have been reputed to break very easily. Since the PlayStation 2, most major console-based video game software is packaged in some sort of keep case, including Nintendo DS cartridge titles, and Sony PSP titles.

The cases are made of soft, clear or colored, polypropylene plastic with a transparent polyethylene outer jacket, usually with a printed paper sleeve behind it. A variety of colors are produced, including black, white, red and clear. On the inside are sets of clips that may hold a booklet or additional sheets of paper with extra information. The DVD is held into place with a small protrusion (a "hub") which fits into the hole in the DVD. For console games like the PlayStation 2 and Nintendo GameCube, an extra protrusion is available for storing memory cards.

...
Wikipedia