The ornamental design for a cover for a football back flap pad, as shown and described.
FIG. 1 is a front perspective view of a cover for a football back flap pad showing my new design.
FIG. 2 is a rear perspective view of the cover for a football back flap pad.
FIG. 3 is a front view of the cover for a football back flap pad.
FIG. 4 is a rear view of the cover for a football back flap pad.
FIG. 5 is a top view of the cover for a football back flap pad.
FIG. 6 is a bottom view of the cover for a football back flap pad.
FIG. 7 is a side view of the cover for a football back flap pad.
FIG. 8 is a second side view of the cover for a football back flap pad; and,
FIG. 9 is a front view showing the cover covering the football back flap pad, attached to football pads and worn by a user.
The dashed or broken lines on the pad in the Figures illustrate stitching and fasteners and form no part of the claimed design. The dashed or broken lines outside of the pad in the Figures illustrate football pads and a user and form no part of the claimed design.