As soon as the girls started pumping I asked why can't we fill the pump up with 6 days of insulin and change the set every 3 days? The CDE said no because the insulin is being stored in a plastic reservoir instead of glass. (And she polices this at each appt. I don't mind.) Three extra days doesn't seem extremely prolonged to me. Do any of you do this? Have you ever seen degradation of the insulin? Does anyone know the science behind plastic vs glass for insulin storage? Thanks!