Provided is a self-closing and automatically fitting device for packaging (e.g. shrink wrapping, fasteners, enclosures of objects). The device includes a wrapping material and/or closure bands/straps which are made of a shape memory material and a non-shape memory material. The device also includes at least one pair of clasp members attached to the wrapping material and/or closure bands/straps. Upon stimulation by a trigger source, the shape memory material deforms and brings the wrapping material to self-assemble about an object to be packed. The self-assembly of the wrapping material and/or closure bands/straps further brings the two clasp members close to each other and facilitate the clasp thereof to form a self-assembled and closed package. The device may also include a motor, a control unit, and sensors which enable a motor actuated fine tensioning of the self-assembled and closed package.