These are two good programs... Image USB is good for the PortableApps project.
OSFClone is good for a standalone disk or USB. Linux boot, copies disks byte by byte so Linux or Windows O/S copies.
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for image, boot os is needed, so why not to use the very reliable clonzilla?
Otto Sykora
Basel, Switzerland
Yes the passmark ImageUSB tool is nice, and already portable in itself. So are other tools such as FTK Imager lite. If I recall OSFClone needs to be booted as a live cd in order to make a bit by bit copy of a disk.