The ornamental design for a portable toolstand, as shown and described.
FIG. 1 is a perspective view of the portable tool stand of the present invention, with broken lines depicting a bench top tool for illustrative purposes only and which form no part of the claimed design.
FIG. 2 is a front elevation view of the portable tool stand of the present invention.
FIG. 3 is a top view of the portable tool stand of the present invention.
FIG. 4 is an end view of the portable tool stand of the present invention, the opposite end being a mirror image thereof; and,
FIG. 5 is a rear elevation view of the portable tool stand of the present invention.