The symbol of quality is still a paper that is made from 100 percent cotton rags. At one time, rag meant cotton taken exclusively from cotton textile remnants. Now very few cotton papers are made from rags, either entirely or partially. The difference between true rag papers and cotton papers made from linters is that the rags have longer cotton fibers and the weaving seems to add strength. Today rag and cotton are terms that are virtually interchangeable.