The Vertx MAK Mags and Kit Standard Accessory System features a hook-and-look closure that wraps around your accessory and attaches to a loop panel for organization. The system is compatible with most Vertx packs and bags and is designed to hold single double-stack pistol magazines up to .45 ACP caliber. Vertx MAK Mags and Kit Standard Accessory System Charcoal/Grey - Gun Cases And Racks at Academy Sports