Compared to most people on here, I've only recently started carrying (heck, I think half the 4-5 digit posters have been carrying since before I was born), and lately I've been trying different ways - IWB, OWB, and pocket with various holsters. Recently it was brought to my attention that I should carry a spare mag, and until now I've been using an old cell phone pouch (although I just got something actually designed for magazines, which will keep it oriented correctly) in my pocket.
However, another thing that's been brought to my attention is that I would be better suited with carrying my spare mags on my belt. Currently I carry my gun IWB in a kydex holster, and I think if I carried mags IWB, I'd need new pants. I have the Springfield double mag holder, but that thing kind of hangs away from the body, and I feel is an inefficient use of space with its design. I even tried getting a holster that had a magazine pouch attached (essentially an elastic pouch), and the mag kept falling out of it.
How do you guys carry your spare mag(s)?