If you have an iMac, there’s backpack for your iMac from Apple Store. for the backpack serves a useful purpose; add memory to your iMac. with a backpack, you can use your iPod or iPhone stick there for free, or plug in your portable optical drives, hard drives, card or other peripherals you may think. The backpack is height adjustable, so you can have more than one monitor on each stem. A single pack costs $ 30, while a Six Pack costs $ 150.Are you interesting with  in  backpack for your iMacs?