This four-pack of air-tight breast milk storage containers is perfect for baby's first few months of feeding. What it does: As you regulate your milk production and baby gets used to latching and feeding from a bottle, use these containers to maximise your fridge storage and feeding space.Set includes:4 x 5 oz. Breast Milk Storage Containers4 x Breast Milk Storage Lids4 x Seals How to use: Simply attach the Manual Breast Pump Module (sold separately) to express into the storage container, then swap the pump with a Breast Milk Storage Lid, instantly converting it into an air-tight and secured storage container for storage in the chiller or a storage bag. To feed, simply reheat to desired temperature and change the lid to a Feeding Teat and Collar for convenience and zero transfer of milk. Plastic/polypropylene/silicone Top-rack dishwasher safe Imported