The ornamental design for packaging for flatbread, as shown and described.
FIG. 1 is a front view of the packaging for flatbread showing our new design; and,
FIG. 2 is a back view thereof.
The packaging is generally flat such that the left and right side views and the top and bottom end views are devoid of surface ornamentation, and are therefore omitted from the drawings. The broken lines depict environmental structure for illustrative purposes only and form no part of the claimed design.