The bag dimension as following : (Due to the different measurement methods, the size specifications of the product and the size specifications of the actual product have an error of 1-2 cm, which is a normal phenomenon.)
1-For Macbook Old air 13 inch (13.3 inch) A1466 A1369/ for Macbook Pro Retina 13 inch A1502 A1425 :
(1) External dimensions : 335 mm * 255 mm
(2) Internal dimensions : 320 mm* 240 mm
2- 2018 New For Macbook air 13 inch touch ID A1932 / 2019 2020 New For Macbook air 13 inch/ for macbook 2019 new pro 13 inch A2159/ for Macbook new pro 13 Touch Bar A1706 A1989 / for Macbook Pro 13 No Touch Bar A1708/ For Huawei Matebook X Pro:
(1) External dimensions : 335 mm * 255 mm
(2) Internal dimensions : 320 mm* 240 mm
3-for most laptop 14.1 inch :