The ornamental design for a weightcarriervest, as shown and described.
FIG. 1 is a top, rear, left perspective view of a weight carrier vest showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines immediately adjacent to the shaded area define the bounds of the claimed design and form no part thereof. The broken lines depicting the remainder of the weight carrier vest form no part of the claimed design.