An electrical power system for crash helmets is described, including a distribution system configured to supply electrical power to a helmet system, a power source configured to supply power to the helmet system over the distribution system, the power source located in a helmet component. A panel member attached to the opposite side of the frame defines an inner space located between the panel member and the fabric. Packaging is effected in film material that has low vapor and gas permeability and in packaging unites that have tight joins or seams.