The ornamental design for an inter-changeable top panel sleeping bag, as shown and described.
FIG. 1 is a perspective view of an inter-changeable top panel sleeping bag, wherein the dog design is shown in broken lines for environment that forms no part of the claimed design;
FIG. 2 is an exploded perspective view thereof;
FIG. 2A is a bottom plan view of the top sheet of the inter-changeable top panel sleeping bag taken along view-line 2A-2A of FIG. 2;
FIG. 2B is a top plan view of the base section of the inter-changeable top panel sleeping bag taken along view line 2B-2B of FIG. 2;
FIG. 3 is a top plan view of the_inter-changeable top panel sleeping bag;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a first side elevation view thereof;
FIG. 6 is a second side elevation view thereof;
FIG. 7 is front elevation view thereof;
FIG. 8 is a rear elevation view thereof; and,
FIG. 9 is a perspective view of the base section of the inter-changeable top panel sleeping bag.