The ornamental design for a portableitemholder, as shown and described.
FIG. 1 is a perspective view of a portable item holder showing my new design;
FIG. 2 is a front view of the portable item holder;
FIG. 3 is a left side view of the portable item holder;
FIG. 4 is a top view of the portable item holder;
FIG. 5 is a bottom view of the portable item holder; and,
FIG. 6 is a cross section view taken along line 6-6 of FIG. 4.
Right side view not shown is a mirror image of the left side view. Rear view not shown is a mirror image of the front view. Hatch lines in FIG. 6 depict internal structure not visible from the exterior that do not form a part of the design sought to be patented. The handle of the portable item holder is shown with a symbolic break in its length. The appearance of any portion of the article between the broken lines forms no part of the claimed design.