The ornamental design for a blisterpackage, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a blister package of the present invention;
FIG. 2 is a top view of the blister pack of FIG. 1;
FIG. 3 is a front view of the blister pack of FIG. 1, the rear view being a mirror image thereof;
FIG. 4 is a right side view of the blister pack of FIG. 1, the left side view being a mirror image thereof; and,
FIG. 5 is a bottom view of the blister pack of FIG. 1.
The broken lines illustrate unclaimed environment only and form no part of the claimed design. However, the surfaces (top flat surface, bottom flat surface, and faceted top surface) up to the broken lines are part of the design.