Abstract: A carton comprises opposite normally flat side panels, a normally flat transverse panel joined to the side panels along one edge of each of the side panels, an upper spout edge which is closed along a line cut across the transverse panel and angled downwardly in the side panels to first opposed flexure points in the side panels, a lower spout edge scored across the transverse panel, below the upper spout edge and angled upwardly in the side panels to the first flexure points, the lower spout edge intersecting each said edge of the side panels at said flexure points, and a score line extending from each of the first flexure points angularly downwardly to third flexure points at each said edge of the side panels below the second flexure points, the transverse panel thus providing, between the third flexure points and the lower spout edge, a trigger surface that can be pressed to swing inwardly of the carton about the third flexure points, forcing the lower spout edge and the second flexure points inwardly, and