The Voodoo Tactical M4 / M16 double mag pouch holds up to 4 magazines for an AR15, M4 Carbine or M16; it even adjusts to hold 2 .308 round magazines. It is made out of tightly stitched nylon for toughness, has MOLLE straps with hard snap buttons for a secure attachment, and the long Velcro strips give a firm hold for keeping your magazines in place.