We claim the ornamental design for a hammock strap with pattern, as shown and described.
FIG. 1 is a front view of a first embodiment of the hammock strap with pattern;
FIG. 2 is a back view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a front view of a second embodiment of the hammock strap with pattern;
FIG. 5 is a back view thereof; and,
FIG. 6 is a side view thereof.
The drawings include symbolic break lines depicted in broken line along the length of the hammock strap with pattern. The break lines and any portion of the article within them form no part of the claimed design. The dot dash dot broken lines along the outside length and width of the drawings depict environmental subject matter that forms no part of the claimed design. At each end of the article, the unshaded areas surrounded by broken line are portions of the hammock strap with pattern that form no part of the claimed design.