The ornamental design for a luggage, as shown and described.
FIG. 1 is a front perspective view of a piece of luggage showing our new, original and ornamental design embodied therein, in accordance with the present invention;
FIG. 2 is a rear perspective view of the piece of luggage of FIG. 1;
FIG. 3 is a front elevational view of the piece of luggage of FIG. 1;
FIG. 4 is a rear elevational view of the piece of luggage of FIG. 1;
FIG. 5 is a top view of the piece of luggage of FIG. 1;
FIG. 6 is a bottom view of the piece of luggage of FIG. 1;
FIG. 7 is a first elevational side view of the piece of luggage of FIG. 1; and,
FIG. 8 is a second elevational side view of the piece of luggage of FIG. 1.
Any dash-dash broken lines in the drawings, including any dash-dash broken line over a claimed surface, represent unclaimed portions of the piece of luggage and form no part of the claimed design.