The ornamental design for a cap with dual bucklefastener, as shown and described.
FIG. 1 is a top front perspective view of a cap with dual buckle fastener, showing my new design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a front elevation view thereof, the rear elevation view being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The dashed broken lines illustrate portions of the cap, as well portions of the dual buckle fastener that form no part of the claimed design. The areas adjacent to the shaded areas are portions of the cap with dual buckle fastener that form no part of the claimed design.