A liner includes a liner subassembly, the liner subassembly comprising a body portion, the body portion comprising a front, a back, a first side, a second side, and a bottom, the body portion defining a cavity; and a flap portion hingedly connected to a top end of the back, the flap portion sized to cover the cavity; and a support connected to the bottom, the support comprising a central body and two end portions, each end portion hingedly connected to the central body, wherein the body portion and the flap portion comprise insulated walls.