The ornamental design for a flaskpurse, as shown and described.
FIG. 1 is a side perspective view of a flask purse, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevation view thereof; and,
FIG. 7 is a right side elevation view thereof.
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.