The disclosure relates to a (10) carton for a diagonally cut sandwich or like foodstuff formed from a blank of card and having triangular end walls (12,13) connected by rectangular side walls (18,19) to form a triangular prism-shaped container. One side wall of the container is hinged to another wall of the container to provide an opening for insertion/removal of foodstuff and to form a lid (25) for closing the opening. The edges of the opening have out-turned flanges (26,28) and the periphery of the lid overlies the out-turned flanges encircling the opening when the lid is in the closed position whereby the lid can be bonded to the flanges to seal the contents of the carton.