These 35mL containers are perfect for smaller amounts of breast milk in the early days of pumping / breast feeding.

They are datable and easily store in refrigerator or freezer. 

This product is compatible with all Medela breastpumps.

• In sealed bag came from an authorized retailer (Don't come in factory retail package)
• Made without BPA
• Pump, store and feed with one container
• Safe design: Medela's signature bottle design allows moms to store their breast milk long-term without losing any of its natural beneficial properties
• Screw on lids: Leak-proof storage, travel and freezing

Breast milk storage tips:
http://www.babycenter.com/2_how-to-store-and-use-breast-milk_10350927.bc