KC057Pls help must reference bag inner dimension ( Length x Width x Thickness ) with your laptop outer dimension before make order.For macbook new 14" and all other brand 14" ultrabook laptop, they all need order 13.3" bag, normal 14" bag will be too big for them.

12 inch bag : Outer dimension 330 x 240 x 30 mm , Inner dimension : 315 x 220 x 25 mm .13.3 inch bag : Outer dimension 345 x 245 x 30 mm , Inner dimension : 330 x 230 x 25 mm .14 inch bag : Outer dimension 375 x 265 x 35 mm , Inner dimension : 355 x 245 x 30 mm .15.4 inch bag : Outer dimension 380 x 270 x 35 mm , Inner dimension : 360 x 250 x 30 mm .15.6 inch bag : Outer dimension 390 x 280 x 40 mm , Inner dimension : 380 x 270 x 35 mm . 2016-2021 Mac Pro 13, 2018-2021 Mac Air 13, For Macbook M1 13 inch, they all are same dimension bag, Bag outer dimension : 330 x 230 x 35 mm , Inner dimension : 310 x 215 x 25 mm.13.3 inch bag is not good fit for all brand laptop 13.3 inch, Such as For macbook new 13.3 inch, own thin screen frame, the laptop outer length is 304 mm,but for macbook old 13.3 inch laptop outer length is 325 mm.14 inch and 15.6 inch bag is aslo cann't perfect fit all brand laptop 14 and 15.6 inch, they all need reference laptop length and width diemension.Ultrabook 13 inch laptop may need choice 12 inch bag.Ultrabook 14 inch laptop may need choice 13 inch bag.Ultrabook 15.6 inch laptop may need choice 14 inch bag.Pls kindly contact with us if you cann't sure which size bag is fit for your laptop.