Not sure that you need any more answers to your question, but I get my nylon bags from MoreBeer, and I give them a good soak in my sanitizing solution, diluted Starsan, before throwing them into the carboy/fermenter. These nylon bags can also be used during your boil so that you don't have tons of hops/hop pellet junk floating around in your wort when you pour into your fermenter. They wash easily in the washing machine too to get all of the hop funk removed afterwards.