The ornamental design for a cap for reusablecoffeecapsule, as shown and described.
FIG. 1 is a top plan view of a cap for reusable coffee capsule, showing my new design;
FIG. 2 is a perspective view thereof;
FIG. 3 is a side elevation view thereof; and,
FIG. 4 is a bottom plan view thereof.
The broken line showing portions of the cap for reusable coffee capsule is for the purpose of illustrating environmental structure and forms not part of the claimed design.