A film packing for a pasty substance comprises a film tube bag (12) having a peripheral wall (14) and two ends (16), and a cover portion (22) fastened to one of the two ends (16) of the film tube bag (12). The cover portion (22) comprises an end face (24) having a passage opening (32) for the passage of pasty substance from the opened film tube bag (12), a peripheral face (26) joining the end face (24), and a sealing element (52) abutting to a receiving headpiece (36) attachable to the end (16) of the film tube bag (12) carrying the cover portion (22). The receiving headpiece (36) surrounds at least the end face (24) and the peripheral face (26) of the cover portion (22) and comprises an outlet piece (44) which is in fluid connection with the passage opening (32) of the cover portion (22) when the receiving headpiece is attached (36). In a first position in which the piercing pin (48) is arranged at a distance from the film tube bag (12), the cover portion (22) is locked to the receiving headpiece (36) for securing against unintended movement of the film tube bag (12) farther into the receiving headpiece. Upon deactivation of the locking device, the cover portion (22) can be moved from this position into a second position in which the piercing pin (48) penetrates the film tube bag (12).