I made this poop bag holder for my dogs leash. I posted the .sldprt and .stl so that you could print or adjust it to your needs. If you do make your own version from my part please share it with me I love to see how people make things better! (That's why I posted it like this). The .sldprt is in SW2018 so if you have an earlier version you won't be able to do much without converting it back and forth from step etc.
Easy to 3d print with minimal supports.