Fastener for disposable waste container liners

A retainer and closure for a garbage can liner bag consisting of a thin flexible disk having a continuous uninterrupted peripheral edge and a centrally located arcuate opening extending through the disk, said opening defined by two spaced apart complementary internal edges of the disk, each of said internal edges of substantially constant curvature with one internal edge convex, the other internal edge concave, and the arcuate opening having two ends terminating within the periphery of said disk, each end comprising a slot defined by a continuation of said internal edges extending substantially perpendicular to the arcuate opening, thereby defining a pair of confronting cooperating flaps in the disk, whereby the disk can be utilized in a configuration in which a portion of the garbage can liner bag is drawn through the arcuate opening in the disk for restricting the bag mouth and retaining a garbage can liner around the exterior of the open top of a garbage can in which the remainder of the bag is disposed, and another configuration in which the compressed mouth of a bag is extended through the arcuate opening in the disk to close the bag.