The bags are intended for storing and freezing of expressed breast milk. They meet the highest standards of hygiene due to gamma radiation sterilization. The stable base of the bag makes it possible to store milk conveniently and protects it from spilling. The air-tight zip-lock closure is easy to open and at the same time ensures safety of the stored milk, additionally preventing odour penetration. The bag features a scale which enables precise dosing of milk, and the white writeable field makes it possible to note the date, hour and amount of expressed breast milk.