The ornamental design for a portable handle, as shown and described.
FIG. 1 is a front, top, and right perspective view of a portable handle which includes a strap, wherein the strap is in a curled state shown attached to the ceiling of a subway car, in accordance with the present invention;
FIG. 2 is a front, top, and right perspective view of the portable handle of FIG. 1, wherein the strap is in a straight state;
FIG. 3 is a rear elevational view of the portable handle of FIG. 1, wherein the strap is in the straight state;
FIG. 4 is a front elevational view of the portable handle of FIG. 1, wherein the strap is in the straight state;
FIG. 5 is a right side elevational view of the portable handle of FIG. 1, wherein the strap is in the straight state;
FIG. 6 is a left side elevational view of the portable handle of FIG. 1, wherein the strap is in the straight state;
FIG. 7 is a top plan view of the portable handle of FIG. 1, wherein the strap is in the straight state; and,
FIG. 8 is a bottom plan view of the portable handle of FIG. 1, wherein the strap is in the straight state.
The broken lines shown in FIG. 1 represent environmental subject matter and form no part of the claimed design.