Stackable assortment system

I present my version of a stackable assortment system with a grid of 50*50, with a grip that fits a 6mm wide sticker from a labelprinter.

More boxes will follow the coming time, and I will also add lids for the boxes.
I'm also considering boxes with an external grip, or a drawer-system that fits the boxes. (Let me know if there is a demand for these types!)

Edit 9-nov-2020:
Updated the naming logic, and some minor design changes to make the grip easier to print
The size is calculated in a 50 x 50 grid, so a box 11 is 50 x 50mm, and a 44 box is 200 x 200mm.
I designed the boxes in a way that the grip can be on the long side and on the short side, for example a box 12 has the grip on the short side, where the box 21 has the grip on the long side.

For the height I started with size S which is 25 mm high.
The size L (The next to be added to this project) will be 48 mm high, so that it is the same height as 2 S boxes stacked.
XL will be 71 mm heigh, and XXL 94, ensuring tha