Film about the glass industry. Men pull out rolls of very thin glass from a machine. American Air Filter Company in Louisville, Kentucky. Glass fiber matting and fabric manufacture. Used to make car bumpers. Glass fibers used to make luggage at H. Coke & Sons in San Francisco. Various footage from the factory. Interesting image of glass fibers sticking to a shaping block in a vacuum chamber. Shredded fibers are sprayed onto the block.Fasteners are attached to the luggage. Luggage tested for water tightness in a tank of water (cool).