Abstract: A package for storing and dispensing granular materials such as dishwashing detergent. The package has a carton section, preferably made from paperboard, that has a plug receptacle preferably in its top wall adjacent the top edge. The package further includes a corner cap for measuring quantities of the granular material. The corner cap form fits over the corner of the package that has the plug receptacle adjacent to it. The cap has a plug extending into its inner container space so as to telescope into the plug receptacle in a complimentary fashion when the cap is placed on the carton. The plug and plug receptacle ensure that the cap remains securely attached to the carton when not in use. The carton also includes a dispensing orifice for dispensing the granular material from the carton into the cap. The plug receptacle can be the dispensing orifice if it extends through the entire distance of the top wall.