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 three 30-round M4/M16 magazines, the . . double holds two 30-round magazines and the single holds one 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.