kevlar brand aramid fiber made by e i dupont de nemours is one type of reinforcing fiber that has been found to work well other types of fiber material could be thin metal wire glass polyester carbon fiber graphite or other fibers or hydrids used in composite structures the fiber can be braided or wound around the liner using a filament winding process a hybrid braiding and filament winding process could also be used in order to prevent abrasion and wear the fiber braid or winding 36 is preferably coated with a flexible protective covering material such as polyurethane as seen in fig2 the coating not only covers the fiber 36 but it impregnates and fills the interstices in the braid or winding other types of coating material could be silicon rubber vinyl or combinations thereof more rigid materials such as epoxy vinylester or polyester resins could also be used depending upon the shape and the configuration of expanded and narrow diameter sections and the intended use it would be possible to coat the entire group of storage and connecting sections by dipping the configured sections in one simultaneous operation and the shape of the adjacent sections would not be discernable the container could also be left uncoated if placed inside a protective pouch or shell the container illustrated having six storage sections of 4 cm inside diameter and 60 cm in length provides a gas storage capacity of approximately 2 700 liters at 600 kg square cm of pressure this would provide the wearer with about 2 hours of breathing gases where the wearer is working.