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Pencil cases can be made from a variety of materials such as wood or metal. Some pencil cases have a hard and rigid shell encasing the pens inside, while others use a softer material such as plastic, leather or cotton. Soft versions are typically fastened with a zipper. Early pencil cases were round or cylindrical in shape.
Zipper slider brings together the two sides of teeth. The popular North American term zipper (UK zip, or occasionally zip-fastener) came from the B. F. Goodrich Company in 1923. The company used Gideon Sundbäck's fastener on a new type of rubber boots (or galoshes) and referred to it as the zipper, and the name stuck. The two chief uses of the ...