A collapsible carton, which may be flat-packed for storage but easily erected to form a many-sided box, and a blank (1) for forming such are disclosed. The carton comprises a base (2) having a plurality of base edges (13a, b, c), and a continuous sidewall (3) defining a base aperture for accepting the base (2), when the carton is erected. In a first aspect, the base (2) comprises two hingedly-joined base portions (11, 12), hingedly joined to the sidewall (3). The carton is characterised in that the base (2) is larger than the base aperture. In a second aspect, the sidewall (3) comprises a plurality of sidewall notches (26a, b, 36a, b). The carton further comprises an integral lid (4) having two lid portions (40, 50) hingedly joined to the sidewall (3). Both lid portions (40, 50) comprise two or more hingedly-joined wings (42a, b, 52a, b). Each wing (42a, b, 52a, b) comprises a wing notch (43a, b, 53a, b) adapted to cooperate with a corresponding one of the sidewall notches (26a, b, 36a, b) such that the lid portions (40, 50) may be secured in a closed configuration when the carton is erected.