I have a Custom Hybrid Kydex/Leather holster for my G23/27.
I usually carry my spare mag in the pocket (if I ever have to deal with a chamber issue).
I have seen single and double mag holsters, IWB and OWB.
I have even read people using cell phone cases.
If I am carrying a G23 mag for backup, how many would you carry (1 or 2)? How do you recommend carrying it for the purposes of access to the mag (IWB or OWB)?