The ornamental design for a flaskpurse, as shown and described.
FIG. 1 is side perspective view of the present invention.
FIG. 2 is a front view of the present invention.
FIG. 3 is rear view of the present invention.
FIG. 4 is a left side view of the present invention.
FIG. 5 is a right side view of the present invention.
FIG. 6 is a top view of the present invention; and,
FIG. 7 is a bottom view of the present invention.
The broken lines depicting a strap in FIG. 1 are for the purpose of depicting portions of the article and form no part of the claim. The broken lines showing a symbolic break in the length of the strap form no part of the claim. It is understood that any portion of the article between the break lines forms no part of the claim.