The Momoczy Silicone Milk Storage Bags are a great eco-friendly milk storage bag that holds milk securely, can be frozen or submeged in warm water for reheating, and doesn't leak. The bags have easy to open/close screw tops to ensure you won't lose a drop of milk, stand up easily for filling, and can stored upright or flat to freeze or refrigerate. While you can't write on the bags to indicate when the milk was stored, it does come with some small cardboard tags to keep track of when you filled the bag. The bags are easy to clean using a small brush or by simply boiling the bag for a few minutes to completely sterilize. It has a looped handle for easy storage or to carry. Because the bags are made of silicone, they are very durable and can be used again and again. The only thing I wish the bag had are small measurements to keep track of how much milk/liquid is in the bag, but that is a minor detail. One thing to note is that if you store milk in the bag that you should carefully squeeze out the air to ensure the milk stays fresh and to avoid creating a "milk line" in the bag. The only other issue I have with the bags is that if you are planning on storing a lot of milk that you'll definitely want more than two bags. Those issues aside, the bags are very well made and will likely last through multiple pregnancies. Overall great option if you're looking for silicone milk storage bags.