Aerosol overcap with evaporation vent

A package for storing a dispensing product, the package comprising

• a can including a vessel formed to include a product-storage chamber and a top closure member coupled to the body to close an opening into the product-storage chamber, the top closure member including a valve cup coupled to the vessel and a product dispenser mounted on the valve cup and configured to dispense product stored in the product-storage chamber to the surroundings, and
• a cap including an imperforate top wall, an interior shell coupled to an underside of the imperforate top wall and configured to mate with the valve cup included in the can to mount the cap on the can, and a chamber side wall coupled to a perimeter edge of the imperforate top wall and arranged to surround the interior shell, wherein the interior shell includes an outer wall facing toward the exterior shell and cooperating with the chamber side wall and a portion of the top wall to form a vapor-discharge chamber therebetween, an inner wall facing away from the outer wall and cooperating with a portion of the imperforate top wall to form a vapor-collection space situated to receive vapor generated by evaporation of any liquid remaining in a reservoir formed in the valve cup after the cap is mounted on the can to cover the valve cup, a bottom edge interconnecting the inner and outer walls of the interior shell, a channel inlet opening into the vapor-collection space, a channel outlet opening into the vapor-discharge chamber, and a first vapor-vent channel extending between and interconnecting the channel inlet and the channel outlet to allow flow of vapor from the vapor-collection space to the vapor-discharge space therethrough while the cap is mounted on the can to cover the valve cup.