"Freezer storage" refers to the act of placing or storing items in a freezer, a cold storage unit that keeps things frozen at very low temperatures. Full definition
It can be stored in freezer storage bags, containers made specifically for breastmilk, a supplemental nursing system, or a bottle ready for use. (en.wikipedia.org)
• It's best to transfer hot food you have cooked to the fridge and then to package for freezer storage within 2 - 3 hours after it has cooled off. (littleremedies.com)
Long - term freezer storage may result to milk degradation. (newkidscenter.com)