Holds a Gas Mask with the back molled. Flap fastening is with a 38mm side release buckle which is adjustable. An eyelet in the bottom allows drainage if water gets inside. Made of Cordura, polyester webbing, stong press domes, side release buckle an eyelet. Dimensions; length 220mm, width 170mm, depth 110mm at the top tapering down to 70mm at the base.