The ornamental design for a tallmug with straw, as shown and described.
FIG. 1 is a side elevational view of a tall mug with straw the opposite side being a mirror image thereof;
FIG. 2 is a rear, elevational view thereof;
FIG. 3 is a top, plan view thereof;
FIG. 4 is an upper perspective view thereof;
FIG. 5 is a lower perspective view thereof;
FIG. 6 is a side elevational view of a tall mug with straw showing a second embodiment of my new design, the opposite side being a mirror image thereof;
FIG. 7 is a rear elevational view thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is an upper, perspective view thereof; and,