Cover film, method of making cover film, and method of using cover film for enclosing compressed material

A method for producing a cover film, comprising the following steps:

• blow extruding a copolymer and other components to form a film tube;
• dividing the film tube into film sheets, the film sheets each including an outer layer and an inner layer;
• the inner layer comprises:
• said copolymer, and said copolymer comprises an ethylene and an α-olefin, wherein the α-olefin is selected from the group consisting of 1-butene, 1-hexene, 1-heptene, and 1-octene, and is used for copolymerization with the ethylene;
• a proportion of said copolymer is more than 5% by weight and less than 50% by weight of the inner layer;
• and
• a linear polyethylene;
• and
• the outer layer does not have any significant proportion of said copolymer, and
• stretching the film sheets in an MDO unit in a longitudinal direction at a temperature at which the copolymer is in molten form and the remaining components are in non-molten form.