This is stackable dice storage with separate trays for sharing with others.

The holes are made for 6x3 magnets (6 per side so 12 per container & 6 for the lid)

The open variant was intended for large dice (such as the oops all ones d20) but can also fit whatever your little heart desires. (Like minis, snacks, or extra dice)

Side note for printing: I would recommend making sure that the infill supports the bottom magnet holes since I've had issues with pressing the magnets in. (The pocket for the magnet broke off on the inside) This shouldn't apply to the lid due to the print orientation having the magnet holes facing up.