FIG. 1 is a perspective view of a first embodiment of the double walled mug showing my design thereof;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a cross-sectional view thereof taken along line 8—8 of FIG. 6;

FIG. 9 is a perspective view of a second embodiment of the double walled mug showing my design thereof;

FIG. 10 is a front view thereof;

FIG. 11 is a back view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a left side view thereof;

FIG. 14 is a top view thereof;

FIG. 15 is a bottom view thereof; and,

FIG. 16 is a cross-sectional view thereof taken along line 16—16 of FIG. 14.