A transport closure for use in a packaging container for bulk solids, said transport closure comprising or consisting of a laminate of a first layer and a second layer, said first layer being delimited by a first layer peripheral edge, said second layer being delimited by a second layer peripheral edge, said second layer comprising or consisting of a weldable material and said first layer having a higher tear strength than said second layer;
- wherein said first layer is provided with a weakening line defining a pull-tab in said first layer and having a first and a second base point, said base points being arranged at a base end of said pull-tab, opposite to a gripping end of said pull-tab, and at a distance d1 and d2 respectively, of from 1 to 30 mm from said first peripheral edge, wherein said weakening line forms one or both of a first and second weakening line leg extending from said one or both of the first and said second base point, respectively, and alongside with said first layer peripheral edge and that said second layer peripheral edge extends beyond said first layer peripheral edge around the perimeter of said transport closure forming a transport closure welding collar.