Medela's Pump and Save bags are a convenient rescue for every mother to store her breastmilk easily in the fridge. Express the milk, label the bag and pop it in the fridge or freezer. Medela Pump and Save bags takes up less space than breastmilk bottles. They are very hygienic and it prevents milk loss by storing the milk directly into the bag. Medela's Pump and Save bags are made up of proven food grade BPA material, to protect your baby from any harmful substances