The ornamental design for the bamboo paper towel holder, as shown in the accompanying drawings.
FIG. 1 is a right perspective view of a bamboo paper towel holder showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof, the side opposite being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
FIG. 7 illustrates an alternate embodiment, showing a contrast in materials using different shadings for different areas of the bamboo paper towel holder illustrated in FIGS. 1 to 6.