The ornamental design for a plasticdunnagebag, as shown and described.
FIG. 1 is a perspective view of a plastic dunnage bag, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The dash-dash broken line showing of portions of the plastic dunnage bag is included for the purpose of illustrating environmental structure and forms no part of the claimed design.