The ornamental design for a portablemodularstoragesystem, as shown and described.
FIG. 1 is a front view of the portable modular storage system showing our new design.
FIG. 2 is an exploded front view thereof;
FIG. 3 is a back view of FIG. 1;
FIG. 4 is an exploded back view thereof;
FIG. 5 is another exploded front view of FIG. 1; and,
FIG. 6 is an exploded front perspective view thereof.
The cutaway symbols illustrated in break lines in the drawings indicate a symbolic break in the length of the design for the portable modular storage system indicating an indeterminate length. The appearance of any portion of the article between the break lines forms no part of the claimed design.
The broken lines shown in the drawings illustrate portions of the portable modular storage system that form no part of the claimed design.