A sheet film pack has a pack housing for receiving a plurality of sheet film units in a stack, and a lid for closing an opening of the pack housing, through which a topmost sheet film unit of the stack is placed in an exposure position. The exposure position is defined by an exposure frame of a pack holder which holds the sheet film pack and is attached to a camera. A film recovery mouth for recovering exposed sheet films one after another is formed in a trailing end of the pack housing, and a cap for closing the film recovery mouth and holding the lid in the closed position is removably attached to the pack housing. The lid is guided along guide rails which are formed on lateral sides of the pack housing to slidably hold lateral edges of the lid. The guide rails extend beyond the film recovery mouth such that the trailing ends of the guide rails are placed inside the cap when the cap is attached to the pack housing. A resilient light-trapping ribbon is disposed on a sliding surface of the pack housing for the lid. The ribbon has a free portion which protrudes toward the lid to be resiliently bent by the lid.