Multi-disc (chubby) Jewel Case
The Chubby case is great for multi disc sets. It is the same size as a jewel case but sits at about one inch wide. Print real estate is two tray cards, but you can use either black or a clear tray to show the backside of the tray card. Usually for 4 disc sets, you can also use a hinged tray and go up to 5 or 6 discs. Wowzers!