The ornamental design for a supportstand for irrigationbag, as shown and described.
FIG. 1 is a perspective view of a support stand for irrigation bag, showing
my new design, the broken line showing of the irrigation bag is for
illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof; and
FIG. 4 is a side elevational view thereof, the opposite side being
identical thereto.