I claim the ornamental design for a flower pot-stabilizing device with handles, as shown and described.
FIG. 1 is a perspective view of a flower pot-stabilizing device with handles showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is an elevational view of the opposing side thereof;
FIG. 4 is a side elevational view perpendicular to the views of FIGS. 2 and 3, the elevational view of the opposing side being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a reduced perspective view showing the flower pot-stabilizing device with handles in use; the broken lines depict environmental structure for illustrative purposes only and form no part of the claimed design.