Pls reference the bag outer dimension ( length x width x thickness ) before your order it. 12 inch bag : Outer dimension 330 x 240 x 30 mm , Inner dimension : 315 x 230 x 25 mm . 13.3 inch bag : Outer dimension 345 x 240 x 30 mm , Inner dimension : 330 x 230 x 25 mm . 14.1 inch bag : Outer dimension 385 x 270 x 35 mm , Inner dimension : 365 x 255 x 30 mm . 15.4 inch bag : Outer dimension 390 x 275 x 35 mm , Inner dimension : 370 x 260 x 30 mm . 15.6 inch bag : Outer dimension 410 x 290 x 40 mm , Inner dimension : 390 x 280 x 35 mm . For Macbook New 13.3 inch, A1706, A1708, A1932,A1989, all are same dimension bag, Outer dimension 330 x 240 x 30 mm , Inner dimension : 315 x 230 x 25 mm . 13.3" bag is good for macbook old air and pro 13.3 inch, it is too bigger for macbook new 13.3 inch Pls careful make choice for macbook new 13.3 inch.