This box has a usable height of 6cm, but perfectly stackable with the "Sister box" of Hünersdorff that only 4.5cm usable height.
For the assortment boxes there are a variety of insert boxes, just search Amazon for "hünersdorff Einsatzbox".
The assortment box itself is 6x4 "units" in size. There are insert boxes in different sizes. I have also indicated how many insert boxes Unmixed fit into an assortment box:
- 1x1 unit (red box) - 24 missions per Sortimentskasten
- 2x1 unit (yellow box) - 12 missions per Sortimentskasten
- 2x2 units (blue box) - 6 inserts per Sortimentskasten
- 3x1 unit (blue box) - 8 inserts per Sortimentskasten
- 3x2 units (green box) - 4 inserts per Sortimentskasten
For me, the Hünersdorff Sortimenetskästen are with the most flexible storage system that I know of and is really worth the money. Hünersdorff manufactures its products by the way her in Germany.