I have the Knog Blinder V Kid and find it brilliant. It’s a little bit long if you’re shorter like me. These is not so much seat post for that and saddle bag but they do a little square blinder too. Will go back by default when I need to. Been using mine for commuting and long rides for 3 years now and has never let me down.
I use this for graval rides to get to the gravel on dark morning’s too.