a method for producing at least one structure by laser action on at least one wall part of a container wall of a product , preferably a plastics container product produced by a blow - molding , filling and sealing method . the particular structure is introduced by the laser action , at least with the laser power , the period of action of the laser , the type of plastics material and the type of desired structure being taken into account , as a linear depression in the one wall part . the depression is delimited at the edge and in a manner following the profile of the linear depression by in each case one elevation brought about under the influence of the intrinsic material stress of the plastics material .