The SideWinder™ Mask Bag features a unique, ergonomically correct side-opening design for easy access. Designed to fit the largest face pieces, including those with voice amplifiers. The side-opening design protects against debris falling into the mask bag, while allowing for maximum ventilation when needed. Interior is soft, easy-to-clean, anti-scratch nylon, guaranteed not to leave fibers on your face piece. Large pocket on back for head sock.