A parameterized version of the Dog Poop Bag Holder by @deepsea. I made it with these measurements:
Bag diameter: 43
Bag inner rod diameter: 6.5
Bag height: 58
The STEP-file has variables in it, so upload it to onshape to edit the measurements.
The author remixed this model.
This model is larger to accomodate larger bags (wider and taller).