The outer material consists of high quality waterproof fabric to protect your laptop from rain, dust and scratches. The interior consists of soft fleece to protect your laptop from bumps, strokes and scratches.Side pocket of the bag is ideal for storing small items such as power adapters, cables, pens and notebooks, with additional comfort.A premium zipper has been thoroughly tested for maximum resistance and safety to keep the valuables safe.Suitable for most laptop for Apple , Microsoft , HP , Dell and more.SIZE10 Inch:External dimensions: 275 x 210 x 25 mm / 10.82 x 8.26 x 0.98 inch, interior dimensions:265 x 200 x 20 mm / 10.43 x 7.87 x 0.79 inch.11 Inch:External dimensions: 320 x 225 x 25 mm / 12.59 x 8.86 x 0.98 inch, interior dimensions:310 x 215 x 20 mm / 12.20 x 8.46 x 0.79 inch.13 Inch:External dimensions: 350 x 250 x 25 mm / 13.77 x 9.84 x 0.98 inch, interior dimensions:340 x 240 x 20 mm / 13.38 x 9.44 x 0.79 inch.14 Inch:External dimensions: 360 x 265 x 25 mm / 14,17 x 10,43 x 0,98 inch, interior dimensions:350 x 255 x 20 mm / 13,78 x 10,04 x 0,79 inch15.6 Inch:External dimensions: 400 x 290 x 25 mm /15,75 x 11,42 x 0,98 inch, interior dimensions:390 x 280 x 20 mm /15,35 x 11,02 x 0,79 inch17 Inch:External dimensions: 435 x 315 x 25 mm /17,13 x 12,40 x 0,98 inch, interior dimensions:425 x 305 x 20 mm /16,73 x 12,01 x 0,79 inchFor different sizes, please allow a size deviation of 1-3cm (1cm=0.39 inches).