Abstract: A glueless paper bag is formed from a single sheet of paper or similar flexible sheet material which is first folded longitudinally upon itself and then transversely to provide an open mouth bag having a closed bottom, pleated, relatively expansible sides, a single ply front wall, a multiple ply rear wall and a locking section which is tucked into the open mouth of the bag in overlying relation to the multiple ply rear wall thereof. The bag may be readily unfolded to provide a rectangular doily or napkin-forming sheet.