The ornamental design for a helmetcarrier, as shown and described.
FIG. 1 is a top view;
FIG. 2 is a left side view;
FIG. 3 is a front view;
FIG. 4 is a right side view;
FIG. 5 is a rear view;
FIG. 6 is a bottom view;
FIG. 7 is a upper rear perspective view;
FIG. 8 is a reduced scale right side, environmental view of a helmet carrier on a travel bag;
FIG. 9 is another environmental, front view of a helmet carrier on a travel bag; and,
FIG. 10 is another environmental, right, top, perspective view of the helmet carrier on a travel bag.
The broken line showing of structure on the carrier and a travel bag is included for the purpose of illustrating environment and forms no part of the claimed design.