To protect your Kirby Morgan Helmet or Band/Mask the KMDSI helmet mask carrying bag Part , 500-901 should be used when transporting or storing your helmet between jobs. The DSI bag is made from extra heavy duty black ripstop nylon. The bottom of the bag is padded for additional protection. Grommeted drain holes allow the bag to breath. The bag is also equipped with large carrying straps and side pockets.