I had/have the same issue... (I do not carry a pot call, but love my box calls).
I purchased a box call holster with a clip, that clips on to my vest in a convenient location... I use the pot call pouches for other miscellaneous nick nacks (such as TP or chalk, etc.).
Also, I found that my mesh water bottle holder fits a box call nicely...
I would go to a satchel if it were not for having to carry a bird (often long distances and up hill). Tried the totes, and I like my game bag much better.