As you can see, the 13" ThinkPad fit just fine on the Lapdesk with plenty of room to spare.
I also tried the Lapdesk with an Acer Aspire One 11.6" system as well as a Lenovo ThinkPad T510 which features a 15.6" display. As Logitech points out in the specifications, anything above a 16" notebook would be too large for the Lapdesk. Although something bigger could physically fit, the system would block the speaker ports.
Continue ahead as we wrap things up with our findings and a conclusion.