The ornamental design for a noveltygiftbag, as shown and described.
FIG. 1 is a perspective view of a novelty gift bag, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is rear (back) 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;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an exploded perspective view thereof.
The broken lines illustrating a bottle depict environmental subject matter that forms no part of the claimed design. The remaining broken lines depict portions of the novelty gift bag that form no part of the claimed design.