The ornamental design for a containerliner, as shown and described.
FIG. 1 is a perspective view of a container liner showing our new design;
FIG. 2 is a front elevation view of the container liner shown in FIG. 1;
FIG. 3 is a rear elevation view of the container liner shown in FIG. 1;
FIG. 4 is a left side elevation view of the container liner shown in FIG. 1;
FIG. 5 is a right side elevation view of the container liner shown in FIG. 1;
FIG. 6 is a top plan view of the container liner shown in FIG. 1;
FIG. 7 is a bottom plan view of the container liner shown in FIG. 1;
FIG. 8 is an extended view of the container liner shown in FIG. 1; and,
FIG. 9 is a perspective and environmental view of the container liner shown in FIG. 1.
The broken lines represent environmental subject matter of an exemplary container and form no part of the claim. The container liner is shown with a symbolic break in its length. The appearance of any portion of the container liner between the break lines forms no part of the claimed design.