A method of manufacturing a packaging film (102, 202) for use in storage of products being sensitive to at least one component in the ambient environment, the method comprising the following steps: - providing an apparatus (100, 200) configured to produce a packaging film (102, 202), the apparatus (100, 200) comprising a cutting station (116, 216), a sealing station (130, 230) that is positioned at a separate location from the cutting station (116, 216), and a transfer device (134, 234) comprising a rotatably mounted disk (136, 236) having a plurality of film supports (138, 238); - conveying an elongated strip of a heat sealable base film (104, 204) on the apparatus (100, 200), wherein the base film comprises a foil and a polymer seal layer atop the foil; - conveying a ribbon (118, 218) of entrained polymer film (106, 206) on the apparatus (100, 200), wherein the entrained polymer is a monolithic material comprising a base polymer and an active agent that absorbs, adsorbs or releases a selected material, and passing the ribbon (118, 218) of entrained polymer film (106, 206) through the cutting station (116, 216) wherein a piece (105, 205) of entrained polymer film (106, 206) is cut from an end section of the ribbon; - transferring the piece (105, 205) of entrained polymer film (106, 206) cut from the ribbon (118, 218) of entrained polymer film (106, 206) from the cutting station (116, 216) to the sealing station (130, 230) by disposing the piece (105, 205) of entrained polymer film (106, 206) on a respective film support (138, 238) and by rotating the transfer device (134, 234), whereupon the piece (105, 205) of entrained polymer film (106, 206) is sealed to a portion of the heat sealable base film (104, 204), thereby forming the packaging film (102, 202). - providing an apparatus (100, 200) configured to produce a packaging film (102, 202), the apparatus (100, 200) comprising a cutting station (116, 216), a sealing station (130, 230) that is positioned at a separate location from the cutting station (116, 216), and a transfer device (134, 234) comprising a rotatably mounted disk (136, 236) having a plurality of film supports (138, 238); - conveying an elongated strip of a heat sealable base film (104, 204) on the apparatus (100, 200), wherein the base film comprises a foil and a polymer seal layer atop the foil; - conveying a ribbon (118, 218) of entrained polymer film (106, 206) on the apparatus (100, 200), wherein the entrained polymer is a monolithic material comprising a base polymer and an active agent that absorbs, adsorbs or releases a selected material, and passing the ribbon (118, 218) of entrained polymer film (106, 206) through the cutting station (116, 216) wherein a piece (105, 205) of entrained polymer film (106, 206) is cut from an end section of the ribbon; - transferring the piece (105, 205) of entrained polymer film (106, 206) cut from the ribbon (118, 218) of entrained polymer film (106, 206) from the cutting station (116, 216) to the sealing station (130, 230) by disposing the piece (105, 205) of entrained polymer film (106, 206) on a respective film support (138, 238) and by rotating the transfer device (134, 234), whereupon the piece (105, 205) of entrained polymer film (106, 206) is sealed to a portion of the heat sealable base film (104, 204), thereby forming the packaging film (102, 202).