My OC holster has a pouch for one spare magazine that holds 10 rds. My mag pouch holds two more of the same. My Kholster IWB conceal holster does not have a place for a spare mag. So, when concealing, I carry a total of 30 rds between my pistol and my spare magazines. When OCing, that jumps to a total of 40. My mag pouch is carried on my left hip, my conceal and OC holsters are carried on my right side, slightly forward.