We claim the ornamental design for a shower storage compartment, as shown and described.
FIG. 1 is a perspective view showing the new design.
FIG. 2 is a front view showing the new design.
FIG. 3 is a top view showing the new design.
FIG. 4 is a bottom view showing the new design; and,
FIG. 5 is a side view showing the new design.
The shading lines shown in the drawings represent the approximate three-dimensional contour of the design, and are not intended to indicate surface decoration.