The ornamental design for a football-themed sleeping bag, as shown and described.
FIG. 1 is a perspective view of a football-themed sleeping bag showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view, shown with the storage pocket in an open position, thereof;
FIG. 4 is a left side elevational thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a rear elevational view thereof; and,
FIG. 8 is a perspective view of the football-themed sleeping bag inverted and stored in its storage pocket.
The broken lines in FIGS. 1, 5, and 7 are representative of the stitching for a pocket that surrounds the foot of the sleeping bag. The jagged lines surrounding the storage pocket in FIG. 3 represent the teeth of a zipper. The broken line showing of the interior of the open pocket in FIG. 3 and the whole of FIG. 8 is for the purpose of illustrating structural environment and forms no part of the claimed design.