The ornamental design for an athleticbag, as shown and described.
FIG. 1 is a perspective view for an athletic 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; and,
FIG. 6 is a top plan view.
The broken lines depict portions of the athletic bag that form no part of the claimed design. The broken lines immediately adjacent to the shaded area depict boundaries of the claimed design that form no part thereof. The shading on the strap represents a terry cloth appearance. The shading shown on the top portion of the athletic bag depicts a contrasting appearance.