I used to use the Carbona Dye catchers, but have been using the Shout Color Catchers since they have been available here. I always use one when I prewash new fabrics and when I have dark clothing to launder. They both work great, but the Shout product is easier to find and less expensive. (The directions on the Carbona product say you can use them many times ?30? or so,but who counts!)