Medela Breast Milk Storage Bags are bags designed to store, transport, and heat breast milk in a practical and hygienic way. Made of durable material and with spill-proof closure, it remains upright without the need for support, in order to facilitate its handling, and can be laid down for storage. It has a carrying bag included, and a large label where you can put all the relevant information. Features Medela Breast Milk Storage Bags has the following features: Long-lasting material with spill-proof closure No support required to stay upright Large label where you can put all relevant information Indications Preserve breast milk Transporting breast milk Heat breast milk Additional Information Free BPA.