The ornamental design for a cargocontainer, as shown and described.
FIG. 1 is a front, top, and right side perspective view of the cargo container, showing the new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the drawings are for illustrative purposes and form no part of the claimed design. The uneven broken lines define a boundary outside of which the claimed design is contained. The claimed design extends to, but does not include the uneven broken lines. The uneven broken lines are merely provided as an illustrative boundary and do not correspond to features present on the cargo container.