This is a case to hold Freak inserts. This model does not work with Freak XL inserts, though you could remix the lid easy enough to make it work.

This is designed to work with 2mm magnets to keep the lid closed. I used these: https://www.amazon.com/gp/product/B07BTK6HVG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I may remix it to make a version with a screw lid, but that will likely make it bigger, so i'm not so sure yet.