This is a genuine US military surplus M4 Single Mag Pouch in Ranger Green or Coyote Brown, made by Eagle Industries. This mag pouch is designed to hold 2 M4 magazines in an elastic banded pocket with a velcro top closure. MOLLE/PALS webbing on the back means this pouch can be attached to any kind of MOLLE gear.
These pouches were acquired from the US military in bulk, and have been previously issued. Overall the pouches are in very good condition with some signs of prior use, possibly including dirt, scratches, or light fading or fraying.