The ornamental design for a carryingcase with attachment, as shown and described.
FIG. 1 is a front perspective view showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a rear 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 an environmental view thereof; and,
FIG. 9 is an environmental view thereof.
The evenly spaced broken lines showing stitching and the dot dash dot dashed broken lines showing a portion of a belt are for the purposes of illustrating environment and form no part of the claimed design.