Abstract: A structure for producing a generally rectangular open-topped carton comprises a pair of opposite side panels having respective parallel bottom edges, a pair of opposite end panels having respective parallel bottom edges, the side and end panels forming a continuous wall, a base panel extending between and connected to the bottom edges of the side panels, each end panel being formed with an outwardly expressed medial fold line and the bottom panel being formed with an upwardly expressed medial fold line, the base panel and the end panels being folded about their respective medial fold lines so that the side panels lie superimposed on one another with the folded base panel between them, each end panel being formed with a pair of flap members hingedly connected to its bottom edge on opposite sides of the medial fold line, the carton being capable of being erected by application of pressure to opposite ends of said structure whereby the end panels, base panel and flap members are unfolded about their respective