Filament fastening system tag

A single use product tag configured for use with a filament fastener to attach the tag to a manufactured article, e.g., a garment. The tag comprises a housing having an access channel leading to an interior cavity. The crossbar end of a filament fastener can be inserted through the access channel for placement into the interior cavity. A closure device is mounted in the tag housing for movement from an open position to a sealing position to block the access channel so as to prevent removal of the crossbar end of the fastener and prevent the insertion of another fastener.