As pictured above and if you haven’t already figured it out, the ego USB Case is your typical iPhone 4/4S casing with the exception of a USB flash drive slotted into the back, allowing for users to transfer files without the need for bringing along an additional gadget (i.e. external hard drive or USB flash drive since it’s already attached to the casing).
Granted probably not the most high-tech of casings, but for those who constantly need to transfer files occasionally or who may want the convenience. It appears that the USB drives will be available in a variety of colors and sizes, ranging from 2GB-32GB, but unfortunately pricing nor availability has been announced yet. [Product page]