I needed a hook to hang my bag from somewhere. Noticed the whiteboard in my office uses some cylinders to hold itself to the wall.

I designed a Hook + Hanger that works well so far. The Fusion 360 file is uploaded so you can change the dimensions to suit your needs. In my case, the hook is designed around a 1 inch cylinder. It snap fits with a little pressure and stays fixed.

It seems very sturdy but I haven't done any strength tests.