This thing is yet another stackable crate design. It offers these features I have not seen elsewhere:

It prints in halves, which means you can print a create (almost) twice as wide as your print bed.

And its customizable. The STLs here are just one example of what the customizer can do. (Don't bother with the web base customizer on thingiverse.com. Its way too old. Download from https://openscad.org/ and run the customizer on your desktop.)

The stacking geometry is selectable in the customizer. You can select tapered sides such that the upper crate inserts into the lower. Or you can select vertical sides that print with 4 locator pins at the corners (and matching holes on the bottom). And you can print an upper-only vertical walled version with holes at the bottom but no pins protruding from the top.