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The ornamental design for a portable mattress, as shown and described. |
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FIG. 1 is a side elevational view of a portable mattress showing my new design, the opposite side being a mirror image of that shown;
FIG. 2 is an end elevational view thereof, the opposite end being a mirror image of that shown;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a perspective view thereof;
FIG. 6 is a perspective view thereof, showing the mattress in a partially folded condition;
FIG. 7 is a side elevational view thereof, showing the mattress in a completely folded position;
FIG. 8 is a perspective view thereof, showing the mattress in a completely folded and partially zippered closed condition; and
FIG. 9 is a perspective view thereof, showing the mattress in a folded and zippered closed condition.
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