FIELD: storage and transportation of loose materials. SUBSTANCE: oriented thermoplastic film material has at least one stretching area in which material is stretched out in cross direction and zones adjoining indicated area at opposite sides in which material is practically not stretched out. Such material is important to prevent rupture of sacks filled up with materials especially in the cases when above indicated areas adjoin welded seam. Sack for loose materials has corrugated areas to provide absorption of impact loads. Corrugated areas have projections teeth arranged across direction of extension. Method of manufacture comes to making cross seam and forming areas of impact load damping. EFFECT: enhanced reliability of storage and transportation. 21 cl, 9 dwg, 1 tbl
