According to various aspects, exemplary embodiments are disclosed liners, linings, tanks including the same, and methods of providing liners and linings for tanks. In an exemplary embodiment, a liner or lining includes a bottom sheet and a plurality of side sheets. At least one pair of adjacent side sheets is joined by an extrusion weld along an interface between the pair of adjacent side sheets. The extrusion weld is coupled to at least one mechanical fastener which is coupled to at least one structural component such that the pair of adjacent side sheets is anchored to the structural component.