Abstract: A bag closure for securely closing a handled shopping bag or the like. The bag closure includes a thin, flexible piece of material having an elongated center strip and a pair of flaps pivotably mounted to opposite sides of the center strip. The center strip defines a slot therein for receiving the handles of a bag. Attached to each of the flaps is a fastener such as adhesive double stick tape for fastening the flap to a side of a bag. To close a bag with the bag closure, the bag handles are slipped through the bag closure slot and the flaps bent to press and fasten against the bag sides. The bag closure fasteners may be fastened and unfastened multiple times, permitting the bag closure to be used over and over again with the same or different bags. The bag closure fastener can also be made so that once the closure is secured, it may be recognizable that the bag was tampered with if opened.