To prevent dislocation in overlapping of a photosensitive sheet and an image receiving sheet.

A bottom lid 2 forms the bottom of the body of a plastic pack which houses peel apart type instant films. A regulation chip 26 has been formed at the forward end of the bottom lid 2 in a body and frictional protrusions 28 have been disposed on the front edge of the chip 26 by hemispherically fixing a thermoplastic resin. The frictional protrusions 28 come in contact with the rear face of an image receiving sheet when an instant film is pulled out, block inadvertent movement of the image receiving sheet by the pulling-out operation, and achieve exact overlapping of a photosensitive sheet and the image receiving sheet.