The ornamental design for a rearpanel for a backpack, as shown and described.
FIG. 1 is a right front perspective view of a rear panel for a backpack showing a first Embodiment of my new design
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right side elevational view, the left side elevational view being a mirror image Thereof;
FIG. 4 is a right front perspective view of a second embodiment of my new design
FIG. 5 is a front elevational view of FIG. 4; and,
FIG. 6 is a right side elevational view of FIG. 4; the left side being a mirror image thereof.
The broken line showing of structural elements is included for the purpose of illustrating portions of the rear panel for a backpack that form no part of the claimed design.
The dashed lines on the garment portion in FIGS. 1, 2, 4, and 5 represent stitching.