Based on Zack Freedman's Gridfinity, the intent of this upload is to share a parametric model of a simple bin.  It is parametric in X, Y, and Z for trays to cups.  The .stl file can be simple or stackable.  I've included a few .stl files as samples and can upload more upon request for those that cannot take advantage of the parametric file.

For those that can take advantage of it, I hope it can inspire those just getting into or learning engineering modeling to explore more advanced modeling.