A patient transfer system includes a patient transfer assembly and a patient transfer device. The assembly includes a sheet of corrugatable material, at least one stiffener that resists corrugation of the sheet in a first dimension when the patient transfer assembly including the sheet corrugated in a second dimension is inserted between the patient and a surface of a first resting device on which the patient rests. The sheet includes portions at which pulling in a direction along the second dimension decorrugates the sheet between the patient and the surface and fasteners. The device includes a sheet engaging assembly that pulls at least one of the fasteners in a direction along the first dimension to slide the decorrugated sheet relative to the surface thereby transferring the patient.