The ornamental design for a cargobasket, as shown and described.
FIG. 1 is a front, top, and left side perspective view of a cargo basket showing the new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation thereof;
FIG. 4 is a right side elevation thereof;
FIG. 5 is a left side elevation thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front, top, and left side perspective view thereof, where the cargo basket is in a condition of use with a faring, crossbars, and clamps; and,
FIG. 9 is a rear, bottom, and right side perspective view thereof.
The dashed lines and structure they depict is shown for the purpose of illustrating environmental subject matter and form no part of the claimed design.