The ornamental design of a backpack with expandablearea, as shown and described.
FIG. 1 is an isometric view of a backpack with expandable area showing our new design with a drawstring in a first position;
FIG. 2 is a front view of the backpack with expandable area of FIG. 1;
FIG. 3 is a top view of the backpack with expandable area of FIG. 1;
FIG. 4 is a bottom view of the backpack with expandable area of FIG. 1;
FIG. 5 is an isometric view of a backpack with expandable area in the expanded position; and
FIG. 6 is a right side view of the backpack with expandable area of FIG. 5; and,
FIG. 7 is a front view of the backpack with expandable area of FIG. 1 with a drawstring in a second position.
The broken lines are provided for illustrative purposes only and form no part of the claimed design. In addition, the portions of the backpack that are not shown in the drawings as well as any portion of the zipper, if any, do not form any part of the claimed design.