The ornamental design for a modularportablestand, as shown and described.
FIG. 1 is an exploded perspective view of an embodiment of a modular portable stand, as viewed from above, showing my new design;
FIG. 2 is an exploded perspective view of a side frame of the modular portable stand shown in FIG. 1;
FIG. 3 is an exploded perspective view of a base frame of the modular portable stand shown in FIG. 1;
FIG. 4 is a perspective view of the modular portable stand shown in FIG. 1, as viewed from above;
FIG. 5 is a side view of a side frame of the modular portable stand shown in FIG. 1;
FIG. 6 is a side view of a base frame of the modular portable stand shown in FIG. 1;
FIG. 7 is an exploded perspective view of a cross support of the modular portable stand shown in FIG. 1; and,
FIG. 8 is an exploded perspective view of a leg of the modular portable stand shown in FIG. 1.
The broken-line disclosure shown in the views is understood to represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design.