FIG. 1 is a first perspective view of a storage stool showing our 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 exploded view of the storage stool in a collapsed state;
FIG. 10 is another exploded view of the storage stool of FIG. 1;
FIG. 11 is another exploded view thereof;
FIG. 12 is an enlarged view of the selected portion 12 in FIG. 1;
FIG. 13 is an enlarged view of the selected portion 13 in FIG. 1; and,
FIG. 14 is an enlarged view of the selected portion 14 in FIG. 2.
The broken lines shown in the drawings depict portions of the storage stool that form no part of the claimed design. The dot-dash-dot broken lines in FIGS. 1, 2, 12, 13, and 14 depict the boundaries of the enlargements that form no part of the claimed design.