A heat-seal polymer film comprising a layer of film has been patented. The film consists essentially of metallocene catalyzed, isotactic ethylene-propylene copolymer having a random comonomer distribution. The ethylene present in the ethylene-propylene copolymer is in an amount of from 1% to 15% by weight. The film has a seal initiation temperature of 80° C to 125° C defined at a seal strength of 200 grams per inch.