I claim the ornamental design for a travel bag, as shown and described.
FIG. 1 is a perspective view of the travel bag in a closed position, in which environmental features of the outer portion of the travel bag are shown;
FIG. 2 is a perspective view of the travel bag in an opened position with various environmental features;
FIG. 3 is a front side view thereof;
FIG. 4 is a rear side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top side view thereof; and,
FIG. 8 is a bottom side view thereof.
Broken lines, such as those representing other internal features and the outer portion of the travel bag as a whole, are for environmental purposes only and form no part of the claimed design. Any subject matter in between the dashed-dotted and jagged lines extending longitudinally across the travel bag and which are positioned adjacent to each other in a center area of the travel bag is not part of the claimed design.
The broken lines on the pouches shown in FIGS. 2 and 7 represent stitching and form part of the claimed design.