Only 'N' is written in the bag size field instead of numbers; what does it mean?

First, look at the numbers. Based on N, LOW CLASSIC's Large Belted Box Bag has WIDTH 41, LENGTH 13, and HEIGHT 28, all in cm^[1][2].

Official materials do not separately disclose what N stands for. However, for items like bags or accessories where there is only one size to choose from, putting a single letter in the size field instead of S, M, L or numbers is a common notation. In this case, the letter itself does not contain size information, and the dimensions attached next to it take on that role instead.

Therefore, what you actually need to read are the three lines. In bag dimensions, it is common for WIDTH to refer to horizontal width, HEIGHT to vertical height, and LENGTH to side depth (thickness). Since the value corresponding to the side for this product is 13cm^[3], you can gauge that it is close to a box shape where the bottom stands rather than lying flat inside. When there is only one size name, translating these three numbers—41, 13, and 28—with a tape measure is the surest way to estimate the size.