This is a desk hook I designed to hold my laptop bag at work.
What makes it convenient is that it fits on multiple desk sizes not just one. That way you can put it in your bag and use it wherever you are.
While I haven't done any official strength testing, you can increase the number of perimeters to increase the strength. If you're putting something heavy on it you'll want to make sure to use a strong filament like PETG.
The uploaded model might be too large for your purposes. Users have reported that printing at 70% of the original size has worked well for them.
I've uploaded a 3mf file that contains a full sized version, a 70% version, and one with no top or bottom layers so the infill is visible.