In a multilayer film including a first layer, a second layer, a third layer, a fourth layer and a fifth layer stacked in this order, the first layer is composed of a propylene-ethylene random copolymer andor a polypropylene homopolymer, and the second layer and the fourth layer are each composed of a mixture of a propylene-ethylene random copolymer and an \u03b1-olefin elastomer. A blow molding machine comprises a press mechanism for operating a mold assembly and a mold assembly according to the invention, each mold component being mounted to a movable member of the press. The first light receiving element receives a light signal and converts the light signal into a first current. The file system, in cooperation with a compression engine, compresses the data blocks into a set of one or more compressed data blocks.