Duffel bag

FIG. 1 is a top, front, right perspective view of a duffel bag showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate portions of the duffel bag and form no part of the claimed design. The vertical dashed lines represent unclaimed subject matter and form no part of the claimed design.