Abstract: A retainer device for a removable container liner, such as a disposable plastic bag, used in conjunction with a container. The retainer consists of hollow cylinder with opened ends having a side cutout segment that joins with a smaller second inwardly tapered cutout segment which second segment is oriented substantially parallel to the front opened end of the retainer and, when mounted on a container, the container's side. To use the device part of the liner's excess amount is first pulled by its exposed edge through the front opened hollow end and interior of the retainer. Next, the pulled exposed edge is wedged into the retainer's tapered cut out section to tension and retain it with respect to the retainer and, if mounted on, the side of the container. A coating of elasticized paint may be used near the smaller tapered cutout segment to assist in the retaining in place of the liner contacted liner material.