The ornamental design for a luggage, as shown and described.
FIG. 1 shows a front perspective view of a panel of a piece of luggage;
FIG. 2 shows a front elevation view of the panel of the luggage of FIG. 1;
FIG. 3 shows a rear elevation view of the panel of the luggage of FIG. 1;
FIG. 4 shows a right elevation view of the panel of the luggage of FIG. 1;
FIG. 5 shows a left elevation view of the panel of the luggage of FIG. 1;
FIG. 6 shows a top view of the panel of the luggage of FIG. 1; and,
FIG. 7 shows a bottom view of the panel of the luggage of FIG. 1.
The dash-dot lines in FIGS. 1-7 illustrate boundaries of the design and the dash-dash lines in FIGS. 1-7 illustrate portions of the luggage that form no part of the claimed invention.