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			   The ornamental design for the stackable storage unit, as shown and described.     
    
    
    
    
    
    
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FIG. 1 is a perspective view of a stackable storage unit illustrating my new design, the material shown in phantom merely illustrating the environment of use, and forming no part of my invention;
FIG. 2 is a right-side elevational view thereof, it being understood that the left-side elevational view and the rear elevational view are both identical thereto;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is an isometric view of the stackable storage unit of FIG. 1, but showing two additional units in broken lines for illustrative purposes only, which form no part of the claimed design.
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