Just squeeze the folded bag top until it is relatively thin and effortlessly slide the clip over the fold.
The color change layers used for the print in the photos are in the provided files. You may want to import the STL file into the slicer yourself and adjust the layers. For instance, the light yellow layer could be made slightly thicker than that provided in the .3mf and .bgcode slicer files.
The print in the photos uses:
**Please see the written note below on the licensing of this remixed model.
The author remixed this model.
Placed the superman logo overtop of the octopus face and extruded the back of the superman logo through the thickness of the bag clip. Also scaled the superman logo some in the thickness direction initially.
The superman logo was obtained here:
https://www.printables.com/model/140371-superman-logo
However, I did not list it as a re-mix model in the form field above since there is some conflict on the form when combining the two models licensing and it wouldn't let me make a license selection to submit the form. However, both of the original models allow remixes.
Regardless of the licensing file on this listing, the superman logo model does not allow:
Commercial Use
Free Cultural Works
Meets Open Definition