This weekend's match will take about 20 mags, I figure - looking at the stage PDFs. That will take all my G17 mags except the four I have loaded with SD rounds for the zombies. I wear six, load one round from a mag in my cargo pocket and then put in a full mag (we are a 10 round state, Clarence!). On DA STREEZ, it's usually just one or two extra mags. The mag pouches are realistic for concealed carry. Galco Matrix or Blade Tech Signature Double Mag Pouch × 2.
The holster is a JM custom Road Dog for a left hander. All this hides nicely under floppy old shirts or a light jacket, puffy or fleece vests for EDC or IDPA (horrors, concealment, horrors). Belts are various companies conventional looking but gun leather belts.
I will also take one extra box of 50 rounds, in the range bag. Thus, the 4 wheel folding car (mine is camo, so it is tactical gear) is a god send for the folding chair and cooler. I always have an extra box 9s and 45s in the car's end of the world kit. So far they have only been used for friend who ran out of ammo, as have been my backup holster for a friend who forgot his. Also have extra cheap ears. Spare boots as I had a set fall apart in a class (Don't buy LLBean boots)!.