See more on portable scanner
The good news is that most of these devices don't weigh all that much. Easy to carry in your luggage or overnight bag, a portable scanner is the ideal business tool for those long trips on the road. Where portable scanners drop the ball a bit is with regard to the quality of the image. All things being equal, a larger desktop scanner will give you a much clearer image than a portable scanner. Nevertheless, they are sufficient for most casual uses, and their small size and portability makes up for any deficiency in image resolution.