Designed to fit in airtight boxes along with 4 1kg spools of filament (e.g. these boxes from Amazon).  Fill with 2mm+ desiccant/silica gel beads, then snap-on the lid.

Total length is 255.4mm, height is 51.8mm.

There are two versions of the model - the PETG model has tighter tolerances (0.1mm) where the lid meets the main body due to the material being inherently more flexible than PLA.  The PLA model has the looser tolerances (0.2mm).  Otherwise they are identical.

Prints without any support at 0.20mm layer height, standard settings in OrcaSlicer for my P1S.

The print in the photos used transparent PETG.

Original models available in Onshape here.