Lansinoh Breastmilk Storage bags have been developed specifically for the freezer, and when stored flat, take up less space and defrost quicker. The medical grade bags are made of low density polyethylene without any plasticisers, meaning there is no risk of any harmful substances leaking into breastmilk. They come pre-sterilised and have a double zipper ensuring a secure seal for safe storage of breastmilk. The convenient write-on tab, positioned above the fill area to eliminate the potential risk of puncture, can be used to record the date, time and volume. The bag's gusseted bottom allows for expansion while the pour spout is conveniently designed to enable a quick and safe transfer.