Note:the size 13.3inch/14inch/15.4inch/15.6inch is screen size, not laptop demension, for different brand and model laptop, the demension is different, so please make sure our sleeve case will fit for you laptop before you pay for your order. and you can also contact us if you don't know whether it will fit. Detail Specifications: 13.3 inch Outer Size:34.5*24.5*2.5cm Inner Size:33.5*23.5*2.5cm Weight:160g 14 inch Outer Size:36.5*26.5*2.5cm Inner Size:35.5*25.5*2.5cm Weight:170g 15.4 inch Outer Size:38.5*28.5*2.5cm Inner Size:37.5*27.5*2.5cm Weight:180g 15.6 inch Outer Size:41*30*3cm Inner Size:40*29*3cm Weight:250g For Macbook Users, if your device is 13 inch, please choose 13.3 inch, and if your device is 15 inch, please choose 15.4 inch.