Game Boy™ Soft Case
The Nintendo Game Boy Soft Case is a storage bag designed to keep the Game Boy console and game cartridges safe. It is made of a material called Belleseime (a Japanese material made of a mixture of polyester and nylon microfibres that is dirt-repellent and very easy to clean). The soft case was originally launched with the original Gameboy in 1989.
The soft case is extremely rare. It was only sold in Japan in a very limited edition. As one of the few Game Boy Classic items, the softcase was given a DMG number (DMG-06) in Nintendo's internal numbering system. For Game Boy collectors, the Soft Case is probably the hardest accessory to find.