The ornamental design for a packingreinforcementmember, as shown and described.
FIG. 1 is a perspective view of a packing reinforcement member;
FIG. 2 is a top plan view of the packing reinforcement member of FIG. 1;
FIG. 3 is a front elevational view of the packing reinforcement member of FIG. 1;
FIG. 4 is a right side elevational view of the packing reinforcement member of FIG. 1 with a left side elevational view being a mirror image thereof; and,
FIG. 5 is a rear elevational view of the packing reinforcement member of FIG. 1.