Grey Ghost Gear just rolled out several new pouches including the Double M4 and Pistol Pouch. This compact pouch lets you hold 2 M4 mags, 2 pistol mags, and 2 chemlights (or similarly shaped items like a Sharpie). The M4 mag pouches are designed to hold 30 round mags and feature bungee retainers. The pistol pouches have magnetic and flap retention.
This is a lot of pouch for the money. Check out the Double M4 and Pistol Pouch and all the other new pouches on GreyGhostGear.com.