| 
 |   The ornamental design for a collapsible shelving system, as shown and described herein.   | |||||||||||||||||
FIG. 1 is a top side perspective view of my collapsible shelving system;
FIG. 2 is a side plan view thereof with the opposite side being a mirror image of the side shown in FIG. 2;
FIG. 3 is a front side plan view thereof;
FIG. 4 is a back side plan view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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