I claim the ornamental design for a dual flashlight holder, as shown and described.
FIG. 1 shows a left, front, and top perspective view of a dual flashlight holder in accordance with an embodiment of the present invention, along with two different sized flashlights to show environment;
FIG. 2 shows an elevational front view of the dual flashlight holder of FIG. 1;
FIG. 3 shows an elevational left view of the dual flashlight holder of FIG. 1;
FIG. 4 shows an elevational top view of the dual flashlight holder of FIG. 1;
FIG. 5 shows an elevational bottom view of the dual flashlight holder of FIG. 1;
FIG. 6 shows an elevational bottom view of the dual flashlight holder of FIG. 1, with a section line added for the purpose of showing where a section goes through in the design; and,
FIG. 7 shows a cross sectional view of the dual flashlight holder of FIG. 1.