I claim the ornamental design for a luggage, as shown and described.
FIG. 1 is a top right perspective view of a luggage showing my new design;
FIG. 2 is a front side elevation view thereof;
FIG. 3 is a rear side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is a right side elevation view thereof; and,
FIG. 10 is a rear perspective view thereof.
The broken lines showing structural portions of the luggage are included for the purpose of illustrating environment and form no part of the claimed design.