Good sling bag, but I use a belt bag.
"When strapped across the waist the strap loosens over time with movement, especially under greater load, I’m a man with pant size of 32 and it’s a bit loose for my waist even when fully shortened. I’d have preferred if the strap slider was more secure so that the strap didn’t slide and lengthen over time and eventually loosens such and slide all the way below my hips. I appreciate that the length of it is so that it dual functions as a sling bag, but in addition to the slider issue, renders it insecure as a belt bag when loaded with over 400g~ (estimate)."