Abstract: A flexible, low profile retainer having a high coefficient of friction that may be adhered to the underside of a shoulder strap to retain the strap in the appropriate location on the shoulder of a user. The retainer is formed from a flexible layer of silicone or thermoplastic rubber and includes an adhesive positioned on one side to adhere the retainer in the appropriate location on the underside of the shoulder strap. The retainer may be dimensioned to be nearly invisible when positioned on the strap, thereby maintaining the aesthetic appeal and overall look of the item being supported by the strap.