I bought the Advanced Ammo Pouch in Multicam to go on my plate carrier, wanting an option for additional mags, a radio, or water bottle, depending on how much ammo I expected to go through in training or what the situation was. I also wanted a place to keep a radio freqs, strip maps, and other documentation I might need. The pouch does it all, with the only "limitation" being that 3 Pmags is a tight fit, and even that is mitigated by USGI mags or working them in a little more. It's a great product that I might get a couple more of in other patterns, for another carrier and possibly a belt set-up.
The Advanced Ammo Pouch is a must have for all section commanders. Robust,well designed and made by those in the know.