An openable and reclosable pour spout forming carton formed from a one-piece blank of paperboard. The carton is generally brick shaped and has a sealing fin on its upper surface, the fin defined by two panels sealingly adhered together. This double thickness fin is adhered to the top of the carton by first folding it and then glueing so as to lie flat. One fin forming flap is provided with a tear strip which, after tearing, defines a tuck tab on the flap. The tuck tab, after partial carton dispensing through the pour spout, is placed beneath a tuck edge portion of the other fin forming panel. By this arrangement, the pour spout can be more fully reclosed and thus will inhibit contamination of the carton contents after the initial carton opening, partial contents dispensing, and pour spout reclosing.