I am using, it's good because you have plenty of storage to put a lot of stuffs but the con is it may weigh you down when running unless you're not aiming for PB.
Also putting more weight can helped you train better. And I like it as it's very secure when running.
Anyway, I am also ordering the wrist one recommended by bro xllms which I had been eyeing for sometime reason being it's more compact but then I don't know how secure is it and how to put a water bottle
But then, for water bottle, I had a good solution. Can buy those collapsible type like below :
https://sg.shp.ee/j4hmYMj