A dispenser is provided for containing and dispensing a liquid or pourable solid product. The dispenser includes a shell having a bottom and a continuous side wall, which together define a hollow cavity. A lid assembly covers the rigid shell and includes a central opening. A flexible pouch is arranged for locating within the hollow cavity and for containing the product to be dispensed. The flexible pouch includes a pouring spout having an outlet opening. The pouring spout is arranged for extending through the lid assembly opening when the flexible pouch is situated within the hollow cavity. The lid assembly additionally includes a set of clamping members positioned to surround the pouring spout. The clamping members are responsive to actuation and arranged to move from a retracted position to a clamping position to prevent movement of the pouring spout when situated within the opening.