This is a Maxpedition Dump Pouch known as the Rollypoly, model 0208F.
The Rollypoly is Maxpedition's licensed adaptation of the elegant MM Folding Dump Pouch design. Precisely sized to hold seven M4 30-rnd mags" stacked either vertically or horizontally" it also functions as a dump pouch for shotgun shells" M4 magazines" or pistol magazines. Alternatively" the Rollypoly is a multi-purpose utility pouch suitable for evidence collection or general storage. It has snag-free elastic shock cord closures that pull from the posterior side of the bag. A Velcro flap which maintains the pouch in its folded position" doubles as a lid or can be concealed completely within the bag.
Features:
Can be attached to MOLLE or PALS webbing by means of two (2) 3 TacTie® Attachment Straps (sold separately);Holds 7 thirty round M16 magazines in horizontal or vertical positions;Cinch cord closure and flap;Belt-closed loop