Flannel material - protection and shock absorption for your lens. * Thickening of the bottom - provide more protection to your lens * 2 ropes with button - tied the bag tight to secure your lens slip out * Approx Interior Dimension: can put LENS not over 5" (L), 3 1/8" (diameter) * REMARK : Please note that the usable height of the pouch is 1-2cm lower than the overall height because of the drawstring closure.