Rebecca J. Rosen, writing for The Atlantic:
Historian and editor of collectSpace.com, Robert Pearlman, raised the separate issue of the quality of the flags. “We didn’t design a special American flag to go to the moon to last thousands of years,” he said. “They literally sent out a secretary to the nearby Sears and bought an off-the-shelf flag and modified it. The natural disintegration of the flag’s material in the harsh conditions on the moon’s surface is to be expected.”
I’ve always wondered what ever happened to those flags. Now I know.