Set the Lapdesk for both a 15 "and a 13.1" one, clearly the smaller laptop is more available space, but even at 15 "my PDA and an ashtray is made in addition! Very handy when the sun shines on the balcony and everything will be taken away! In addition, I turn my laptop no longer when I am wearing in single-handed! The only thing that bothers me, but it was rightly no deduction of stars, the color, or the gray foam! + Light + Space + Work in comfort + Laptop no longer overheated! - Color, pollution of gray foam