Pouch

A pouch comprising:

• a first compound film forming a front surface of the pouch and comprising (i) a first resin film having a predetermined tear strength and a linear slit having un-cut portions provided therein, (ii) a second resin film having a good heat adhesive property laminated on one surface of said first resin film, and (iii) a third resin film having a predetermined tear strength laminated adjacent to said first resin film;
• said first resin film of said first compound film having an orientation along which it has a tendency to tear, the orientation extending in a direction inclined with respect to the direction of said linear slit by a positive angle X, said third resin film of said first compound film having an orientation along which it has a tendency to tear, the orientation extending in a direction inclined with respect to the direction of said linear slit by a negative angle Y, wherein angles X and Y are substantially equal in magnitude;
• a second compound film forming a back surface of the pouch and comprising (i) a first resin film having a predetermined tear strength and a linear slit having un-cut portions provided therein, (ii) a second resin film having a good heat adhesive property laminated on one surface of said first resin film, and (iii) a third resin film having a predetermined tear strength laminated adjacent to said first resin film;
• said first resin film of said second compound film having an orientation along which it has a tendency to tear, the orientation extending in a direction inclined with respect to the direction of said linear slit by a positive angle X, said third resin film of said second compound film having an orientation along which it has a tendency to tear, the orientation extending in a direction inclined with respect to the direction of said linear slit by a negative angle Y, wherein angles X and Y are substantially equal in magnitude;
• wherein said first and second compound films are overlapped with each ocher and peripheral portions thereof are heat fused such that (a) the second resin films are disposed inside the pouch, (b) the linear slits formed in the first resin films are positioned coincident with each other, and (c) the orientations of the first and third resin films of the first compound film are substantially aligned with the orientations of the first and third resin films of the second compound film, respectively.