TwelveSouth releases the BackPack, an adjustable shelf designed to be attached to the back of Apple’s iMac or Cinema Displays. This handy little piece of heavy gauge steel is perfectly sized to hold hard drives, USB peripherals or even a Mac mini.
You can adjust the height of the BackPack to fit your needs and you may want to have two BackPacks on your iMac. The BackPack fits all iMacs and Apple Cinema Displays with with metal L-shape desk stand. Each of the sleek shelf is priced at $29.99 or you can get the 6-Pack for $149.99.