The ornamental design for sleep suit bag, as shown and described.
FIG. 1 is a front view of a sleep suit bag in accordance with my design, the sleep suit bag shown in a first or sleeping bag configuration.
FIG. 2 is a rear view thereof.
FIG. 3 is a top view thereof.
FIG. 4 is a bottom view thereof.
FIG. 5 is a right side view thereof, it being understood that the opposite side to that shown is a substantial mirror image thereof.
FIG. 6 is another front view thereof, the sleep suit bag shown in a second configuration with separated leg portions, it being understood that the top and right side views of the sleep suit bag are identical in the first and second configurations and further that the left side view in the second configuration is a mirror image of the right side view of the first configuration.
FIG. 7 is rear view thereof.
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a perspective view thereof.
The broken lines in the drawings are included for the purpose of illustrating environment and forms no part of the claimed design.