The M4/M16 Open Top Mag Pouches with Bungee System adapts to any universal vest, belt or platform. The Triple M4/M16 Mag Pouch Holds 3 30-round M4/M16 magazines, the double holds 2 30-round magazines and the single holds 1 30-round magazine all are secured in place by our elastic bungee system. We have added front universal strapping so you can attach pistol mag pouches, grenade pouches etc.