We’re wired to think of portability as a function of how easy it is to carry something, and thus as a combination of compactness and weight. It’s that simple, and probably has been ever since man thought to carry fire with him rather than build a new one each day after sundown.
However, it’s wrong to apply this way of thinking to consumer electronics. While once portability was defined by height, length and width, it’s now measured much more subjectively: by its functions.
