The ornamental design for a portabletractiondevice, as shown and described.
FIG. 1 illustrates a top, right perspective view of a portable traction device incorporating a new design, the portable traction device shown configured for use without a user associated therewith;
FIG. 2 illustrates a front plan view thereof;
FIG. 3 illustrates a rear plan view thereof;
FIG. 4 illustrates a top elevation view thereof;
FIG. 5 illustrates a bottom elevation view thereof;
FIG. 6 illustrates a right side elevation view thereof; and,
FIG. 7 illustrates a left side elevation view thereof.
In the drawings, the broken lines depict stitching and portions of the portable traction device and form no part of the claimed design. The broken lines shown on the surface of the straps illustrated in FIGS. 1, 2, 6, and 7 depict portions of the straps and form no part of the claimed design.