I think 13 inch is very portable and the right size. Larger than a tablet, but it feels only a little bigger. You should look at this size if you're looking around. Smaller and you'll feel like the screen isn't big enough and will be hard to read, larger and it won't fit in most of the bags that are simple. Remember, this is diagonal and about the size of a sheet of paper in landscape (8.5x11). The height is probably .5 inches shorter, and the width is about an inch wider. Hope that helps.