I think what he's asking about is a flash drive with a microUSB connector...not full sized USB. So that no adapter is needed. Personally, I haven't seen these but they've got to exist I would think. There's of course a ton of USB flash drives to choose from like Drew said. Once we get our Nexus 7s rooted and have StickMount installed this would be the easiest way to save/upload files to the device I should think.