SIZE 10 Inch: External Dimensions: 10.4" x 7.7" x 0.8" / 26.5 x 19.5 x 2.0 cm, Internal Dimensions:10.0" x 7.3" x 0.6" / 25.5 x 18.5 x 1.5 cm. 11 Inch: External Dimensions: 12.4" x 8.7" x 0.8" / 31.5 x 22.0 x 2.0 cm, Internal Dimensions: 12.0" x 8.3" x 0.6" / 30.5 x 21.0 x 1.5 cm. 13 Inch: External Dimensions: 13.4" x 9.4" x 0.8" / 34.0 x 24.0 x 2.0 cm, Internal Dimensions:13.0" x 9.0" x 0.6" / 33.0 x 23.0 x 1.5 cm. 14 Inch: External Dimensions :14.0" x 10.0" x 0.8" / 35.5 x 25.5 x 2.0 cm, Internal Dimensions : 13.6" x 9.6" x 0.6" / 34.5 x 24.5 x 1.5 cm. 156 Inch: External Dimensions: 15.7" x 11.2" x 0.8" / 40.0 x 28.5 x 2.0 cm, Internal Dimensions: 15.4" x 10.8" x 0.6" / 39.0 x 27.5 x 1.5 cm. 17 Inch: External Dimensions : 17.7" 13" 0.8" ; Internal Dimensions : 17.3" 12.6" 0.6" The water-resistant exterior to protect your device against accidental spills;Featuring a polyester foam padding layer and soft fluff inner foam cushions to protect your tablet/laptop against dust, scratches, drops, and shocks. An extra front pocket of the case is ideal for storage of small items such as power adapters, cables, pens and notepads, offering added convenience. Slim and lightweight, make it easily to slide into briefcase, backpack or other bags. Compatible Devices : This laptop sleeve is ideal fit for most of laptops, may not snugly fit all computers due to variations in the sizes of different models. Please refer to the internal dimensions.