Has anyone ever used this sort of thing for supporting a monopod? (Note this query is not about specific brands but about the concept of having a pocket attached to your belt with which to rest your monopod in)

Capture.PNG

Just wondering if they are any good. Needing a monopod of at least 170cm, something like this could mean a shorter one (which is far more available) is on the cards...

Note, it would be for supporting my sigma 150-600...