Pegboard Mount
To stack two bins: the bin on top needs Stackable base: Stackable. The bin underneath needs Lid for stacking, or its own Stackable base with the same footprint and wall thickness.
Hinged on the back edge, inside the bin. Thread a strand of 1.75 mm filament through the hinge as its pin.
The alignment lip is a thin tab under the two front corners of the lid that drops into the bin so the lid sits straight. A hinged lid with the lip on needs support when printed — that is expected and fine.
Planning only — does not change the bin.
Very thin — may not print reliably with standard nozzle/slicer settings.