Adjustable straps for holding down loads; top unbuckles forming swing-down extension. Outside zip and inside Velcro flat-pockets; screws into hard point system holes. Can hold bump-helmets beneath; requires 4x hardpoint(tm) hardware kit (8 screws total) and 2x hardpoint(tm) SG-1 (4 backers total). Main material: invista(r) 1000D CORDURA(R) (polyester for Gray color); PU x2 water repellent coated for superior water resistance. Overall size: ~18.9" L x 11" W x 1" D (48 x 28 x 2.5 cm); Actual panel size: ~15.4" L x 8.5" W x 0.2" D (39 x 21.5 x 0.4 cm).