The present disclosure relates to a trash bag retaining apparatus and system that secures a trash bag inside a trash receptacle and enables a sliding motion for subsequent removal of the secured trash bag. In particular, the apparatus includes a proximal end insertable into a support arm of a trash receptacle. The distal end includes a slide stop in addition to an abutment face that abuts the support arm upon insertion of the proximal end into the support arm. The abutment face is sized and shaped to match a size and shape of the support arm. Further, the distal end also includes one or more surfaces defining an inlet, positioned between the slide stop and the abutment face, where the trash bag retaining apparatus can secure a portion of the trash bag to the support arm.