Abstract: A protective cover for preventing loss of produce from open-topped cardboard flats during transport comprises a flexible sheet of paper coated with a moisture-resistant layer. The sheet has flaps with adhesive strips which may be affixed to sides of the flat after stretching the sheet over the open part of the flat. The protective covers are supplied in stacks, mounted on a rod, and may be torn off one by one. In one embodiment the sheet is supplied in a folded condition in which the moisture-resistant layer also serves as a release layer temporarily covering the adhesive strips. In another embodiment, the adhesive strips on all but one layer in the stack are protected by the moisture-resistant layer of a next sheet in the stack. In a third embodiment, the adhesive strips are protected by peelable release liners.