the packing container in accordance with the invention is of a parallelepipedic main shape with substantially plane side walls 1 , an upper end wall 2 and a bottom wall which , however , is not visible on the drawing . the packing container is manufactured from the packing laminate mentioned in the introduction which laminate comprises a carrier layer of paper that is coated on both sides with polyethylene . the material is dimensionally relatively stable . in order to facilitate the folding necessary for the formation of the packing container , the laminate is provided with a number of folding or crease lines , some of which are visible on the drawing . the packing container is manufactured in accordance with the known procedure , that is the weblike packing laminate is , converted by folding into a tube which is then filled with the intended contents . thereafter , the filled tube is flattened and sealed transversely in narrow zones extending transversely across the tube . after cutting through these transverse sealing zones , wholly filled , cushion - like packages are obtained which by means of form - processing are converted to packages of the parallelepipedic shape shown . the transverse sealing zone forms a sealing fin 3 which extends over the upper side 2 of the package . a corresponding sealing fin extends over the bottom wall of the packing container , but is not visible on the drawing . the sealing fin 3 is folded down during the formation of the packing container to rest against the upper end wall 2 of the packing container . when the wholly filled packing container is form - processed from cushion - shape to parallelepipedic shape , a surplus of material arises which is in the form of four triangular double - walled lugs 4 that are located at the corner portions of the packing container . two of these four corner lugs are folded in and sealed to the bottom wall of the packing container ( not shown ) whereas the other two lugs are each sealed to a side wall 1 . the lugs 4 comprise a part of the sealing fin 3 , a part of two triangular spout panels 5 situated on either side of the sealing fin , which panels are connected with , and partly are also constituted of , material from the upper end wall 2 of the packing container , and a triangular panel 6 situated underneath the normally folded down part of the corner lug 4 ( visible in fig1 on the folded - up corner lug acting as a pouring spout ) which panel constitutes a continuation of the side wall 1 of the packing container . the triangular panel 6 is delimited from the side wall 1 by means of a crease line 7 and from the two triangular panels 5 by means of crease lines 8 . the crease lines are of the conventional type , that is to say , they are constituted of linear compressions of the packing laminate produced earlier , e . g ., during the manufacture of the material . between the two wall panels 5 and the upper surface 2 of the packing container ( which may be regarded as consisting of two partial surfaces separated from one another by means of the sealing fin 3 ), weakening lines 9 are present which extend substantially in the direction from the corner 10 of the pouring spout connected to the upper wall 2 to the sealing fin 3 running centrally over the upper wall . the weakening lines 9 terminate at a small distance from the said corner 10 and the sealing fin 3 , respectively , and may comprise , moreover , one or more partial lines that will be explained in more detail in the following . as is also shown in the figures , a base line 11 extending between the sealing fin 3 and the upper surface of the packing container 2 along the two wall panels 5 is in the form of a cutting line which line after opening of the packing container separates one end part of the sealing fin 3 from adjoining parts of the packing container . the cutting line may be constituted of an opening indication line or , e . g ., a perforation . in this manner , opening of the packing container is made possible after the corner lug 4 forming the pouring spout has been folded up such that the front end of the sealing fin 3 is gripped between thumb and forefinger and torn off so that a pouring opening 12 is obtained . the opening indication lines extend from one end of the sealing fin 3 to , or a little past , a point 13 located along the base line 11 , substantially in the region where the upper panel 2 of the packing container passes into the panels 5 forming the pouring spout . when the packing container in accordance with the invention is to be opened , the folded down corner lug 4 , which is intended for opening , is detached first from its position of sealed attachment to the side wall 1 of the packing container by breaking the seal between the surface 6 of the corner lug and folding the side wall 1 with one finger and the corner lug upward . thereafter , the two triangular surfaces 5 are pressed toward one another at the same time the part of the transverse sealing fin 3 situated above the surfaces 5 is gripped . with the help of the opening indication line situated along a part of the base line 11 of the perforation fin , it is possible to subsequently tear apart the packing laminate in the transition area located between the triangular panels 5 and the sealing fin , thus forming the pouring opening 12 . the torn up part of the sealing fin 3 can be folded backwards as shown in fig2 . depending upon the rigidity and quality of the packing laminate , a pressure against the front triangular wall panel 6 is then required for the pouring spout to obtain the correct shape . this shape is obtained by folding the rear parts of the two triangular panels 5 upward upwards from their respective original positions to a position that is substantially level with the upper surface 2 of the packing container . the upward folding of the said parts of the panels 5 is realized by folding the packing laminate along the weakening lines 9 which lines extend in a direction from the corner 10 of the pouring spout connected to the upper wall 2 to the base line 11 of the sealing fin 3 . the combined resistance against this folding is reduced appreciably in accordance with the invention in that the two weakening lines 9 extend toward the sealing fin 3 at unequal angles . that is to say , the weakening lines 9 or their imaginary extensions reach the sealing fin at two different points . owing to this design , the elevation of the packing laminate in the weakening lines 9 will not occur simultaneously on the two sides of the sealing fin 3 . more particularly , the weakening line 9 which runs at the more obtuse angle to the sealing fin 3 will serve first as a folding line and only afterward will the material be folded along the weakening line 9 located on the opposite side of the sealing fin 3 which runs at a more acute angle in relation to the sealing fin 3 . through this successive folding of the two halves of the upper container wall 2 , a combined effect between the two wall halves that otherwise would render more difficult the formation of the pouring spout is : avoided . this design has been found in practice to appreciably facilitate the shaping of the pouring spout . the design in accordance with the present invention comprising weakening lines 9 that extend at unequal angles has also been found to contribute to a better retention of the desired shape of the ready - shaped pouring spout . this shape retention is due to the packing laminate being bent more strongly along the two weakening lines 9 when these lines are not utilized at the same time . the previous risk of both two - part wall panels 5 being folded inward rather than outward during the outward folding of the pouring spout has been considerably reduced in accordance with the present invention . practical trials with the present invention indicate that the positive effects which are achieved by a displaced arrangement of the two weakening lines 9 is greatest when the weakening lines or their extensions arrive at the base line 11 of the sealing fin at two points situated at a distance amounting to 1 / 3 - 1 / 10 of the length of the lines 9 . for reason of geometry , formation of the pouring spout at a greater distance along the length of the lines 9 becomes more difficult . additionally , the spout tends to become crooked , whereas in the case of smaller distances , the positive effect is reduced to such a degree that the difference between packing containers in accordance with the invention and packing containers with conventional weakening lines becomes very small . the weakening lines 9 are preferably realized as crease lines or perforations that are provided in the carrier layer prior to the application of the watertight plastic layers of the laminate . as shown in the figures , each weakening line 9 is preferably doubled so that it comprises one or more partial lines which run at a small mutual distance in the principal direction of the weakening line . as a result of this design , the folding is divided into a number of smaller partial foldings each of which further diminishes the force required for the folding and contributes to the maintenance of the outwardly folded wall surface 5 remaining in the desired position . as discussed above , the weakening lines 9 ( whether they are single or double ) extend substantially between the corner 10 and the base line 11 of the sealing fin 3 . however , it is also possible to allow the weakening lines 9 to terminate at a small distance from the said corner 10 or the base line 11 of the sealing fin 3 . this design facilitates manufacture , since it is usually difficult to make a great number of weakening lines meet at the same point . the relatively short distance which remains between the end point of the weakening line and the corner 10 or the base line 11 , respectively , has been found to be of no significance for the formation of the pouring spout . the arrangement in accordance with the present invention has been described in connection with a parallelepipedic packing container . however , this arrangement may also be used , in other types of packing containers having upper surfaces of essentially the same type as has been described . thus , the invention is also applicable , for example , to packing containers of the so - called gable - top type , in which the upper surface or surfaces form in a ridge - like manner a greater or lesser angle to one another and the corner lugs are folded in under the two upper surfaces when the package is closed . it is also possible to use the invention in packing containers of the type that , when opened , the material layers sealed together in the sealing fin 3 are separate from one another manually or by some auxiliary means , e . g ., a tearing element inserted in the sealing fin in the form of a cord or the like . the arrangement in accordance with the invention is thus applicable to a number of different types of packing containers and provides an optimum solution to the problem of forming and retaining a safely functioning pouring spout .