Even for the same size, there will be a slight difference in size due to the different brands of notebooks. For example, for the same 14.1-inch notebook bag, Lenovo or BENQ is about 0.5-1.0 cm thicker than DELL. Generally speaking, if you decide to buy a notebook inner bag, you need to make a "three circumference measurement" of your laptop in advance, know its exact length, width and height, and then you will be prepared to buy it.