Avent 25 Breast Milk Storage Bags 180ml is a system of sachets elaborated for the ultimate protection and storage for your breast milk.Bags are pre-sterilised. The tamper has evident seal for complete hygiene; the seams are reinforced and with dual layer, for a riskless storage without leak, in the fridge or freezer, and the double zip lid secure and leak proof too.The opening is wide, for an easy filling and pouring, and the sachet has a self standing base.0%BPA.