I would be inclined to say that the Power Pack is great for those who are new to Norwex and that the Double Duty is for seasoned Norwex customers. What is your opinion? We want to get you started with the microfiber to show you how a-mazing and powerful it is! How great is it to be able to clean and clean and clean and never have to ration or worry you’ll run out? You can keep going until the job is satisfactorily done. That is a great feeling! And check out the new double sided kitchen towel! Crumb catching and polishing in one cloth!