Nanobebe innovative and modern breastmilk storage bags are designed to prevent both spillage and spoilage, and most importantly, protect your precious milk. Designed to hold milk in a thin layer, they cool and thaw quickly, reducing bacterial growth risk during cooling, and preserving nutrients from the dangers of overheating. Nanobebe breastmilk storage bags are durable, leak-proof, made from extra-thick plastic, and feature a double-zipper closure.