Abstract: A backrest device includes a base and support members to carry and support a seat back in space relation to a seat bottom of a support structure, such as a bucket with a lid. The backrest device enhances the use of the bucket as seating by providing back support. When secured to a bucket, a base of the backrest device extends around the periphery of the bucket. A first support member and a second support member are supported by the base, so that each support member extends upwardly from the base when the base is secured to the bucket. A seat back has a first end that is secured to the upper end of the first support member, and a second end that is secured to the upper end of the second support member to provide an improved seat.