This size fits popular 11"-13" laptops like Apple MacBook Pro 13" (late-2016), Apple iPad Pro 12.9", Dell XPS13 & Inspiron 11 (11.6"), HP Pavillion x360 (11.6") & EliteBook (12.5"), and Microsoft Surface Book, and features a unique hidden pocket for your stylus! It measures 12.4in. (31.5cm) x 9.3in. (23.5cm) x 0.47in. (1.20cm) (stretches to fit devices up to 0.9in. in thickness)