From MusicBrainz Wiki
Type Image Description
Jewel case Jewel Case 02.jpg The traditional CD case, made of hard, brittle plastic.
Super Jewel Box/Case SuperJewelCase.jpg Similar to the regular jewel case, but with rounded corners and a latch closing mechanism.
Slim Jewel Case Packaging Slimcase.jpg A thinner jewel case, commonly used for CD singles.
Digipak Sugarcane-Digipak.jpg A folded case, typically made of coated paperboard, with a plastic tray glued into it.
Cardboard/Paper Sleeve LP Sleeve.jpg
Packaging Paper Sleeve with CD.jpg
A sleeve made of paper, paperboard, or cardboard. Traditional packaging for records, also seen with CDs.
Keep Case Amaray-case.jpg The traditional DVD case, made of soft plastic (usually) dark grey with a thin transparent plastic cover protecting the artwork.
None Packaging-None.png No packaging at all. Common for digital media (downloads).
Cassette Case Audio cassette TDK D90 (3).jpg Regular plastic case for a cassette.
Book A book with a sleeve containing a medium (usually a CD).
Fatbox A double-sided, double-width jewel case normally holding 2 to 4 CDs, but (with Smart Tray or Brilliant Box inside) capable of up to 6 CDs.
Snap Case A digipak-like case held together with a "snapping" plastic closure.
Gatefold Cover A cardboard sleeve that folds in halves, thirds, etc. It can hold multiple records or CDs as well as booklets, posters and other memorabilia.
Discbox Slider A pouch-like package with an internal mechanism that pushes the contents (usually a CD) out of the case when the lid flap is opened.