The Breastmilk Storage Bag’s extra-durable design works overtime, with additional exterior trim to cushion in case of dropping. Double zip seals keep the air out while the super-thick material keeps the breastmilk fresh in the freezer or fridge. Gusseted bottom holds bag upright Perforated top makes for easy-open Pre-sterilized for immediate use Area on bag for freshness label and baby’s name 6 oz/180 ml bags BPA free