The ornamental design for a combinablestoragerack, as shown and described.
FIG. 1 is a first perspective view of a combinable storage rack showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is an enlarged view of the selected portion in FIG. 1;
FIG. 10 is an enlarged view of the selected portion in FIG. 1;
FIG. 11 is a perspective view of the first using state of the combinable storage rack thereof; and,
FIG. 12 is a perspective view of the second using state of the combinable storage rack thereof.
The broken lines shown in the drawings depict portions of the combinable storage rack in which the design is embodied that form no part of the claimed design.