Nope, sorry, Dell: You do not have the lightest 13-inch laptop. That distinction belongs to Lenovo. But could you have the smallest 13-inch notebook? Maybe. The company just announced a redesigned version of its XPS 13 Ultrabook, and thanks to a nearly bezel-less display, it's about as compact as an 11- or 12-inch laptop. So how small is that, exactly? Let's put it this way: If you were to set it down on top of a MacBook Air, you'd have lots of room left over, both length-wise and width-wise. That's because the Air, and other machines like it, have relatively thick bezels surrounding the display; on the XPS 13, that buffer space measures just 5mm wide.