I would wonder to what extent colour catchers are really necessary... this is probably because I live in a country where they are not available and I have never felt any need to use them. When I think new clothes or fabric may bleed, I simply wash them separately, with vinegar in the rinse until the colours are stabilized. I mean too, that if we stick to good old clothes sorting by colour groups, and use warm water, colour catchers are superfluous.