The ornamental design for a set of stackabletableware, as shown and described.
FIG. 1 is a top view of the set of stackable tableware
FIG. 2 is a perspective view of the set of stackable tableware
FIG. 3 is an exploded view of the set of stackable tableware
FIG. 4 is a side view of the set of stackable tableware; and,
FIG. 5 is a cross section of the set of stackable tableware taken along line 5-5 in FIG. 1.
The set of stackable tableware is characterized by several plates and/or bowls that are stacked together to form a coherent three dimensional oblong egg-like shape.