Stacking insert with pattern

[0001]FIG. 1 is a top perspective view of a stacking insert;

[0002]FIG. 2 is a bottom perspective view of the stacking insert shown in FIG. 1;

[0003]FIG. 3 is top plan view thereof;

[0004]FIG. 4 is a front elevational view thereof; and,

[0005]FIG. 5 is a right-side elevational view thereof.

[0006]The ornamental design which is claimed is shown in solid lines in the drawings. Broken lines in the FIGS. do not form any part of the claimed design. A left-side elevational view is not shown because it is a mirror image to the right-side elevational view shown in FIG. 5. A rear elevational view is not shown because it is a mirror image to the front elevational view shown in FIG. 4.