Abstract: A film sheet package comprising a stack of film sheets wrapped in a light-tight flexible wrapper sleeve (33), one end of the sleeve having a closed flap (26) and the opposite end of the sleeve having an open flap (27) that is folded to light-tightly close the package, wherein the side ends (53, 54) of the open flap are tucked in, the top end (56) of said flap is folded back at least once, but not so far that said top end, or a portion thereof, becomes wedged between the bottom end of said flap and the corresponding rear face of the package as said flap is folded on the top face of the package, and that said flap is fixed on said top face through rupturable sealing means (28).