I use them on Batiks of any size. For smaller sizes I use the lingerie bags. just for good measure I use the color catchers all the time. Even on older fabrics purchased from garage/estate sales. They also help absorb old odors along with using ARm and Hammer soap and vinegar and ammonia. Cuts the oil from the perfumes and helps eliminate the deodorant stains from the underarms of old shirts and blouses.