Nursing moms told us again and again that after trying multiple brands of breast milk storage bags, Milkies were the clear favorite. First and foremost these bags are thick. Not only is this important when storing bags so they dont burst but it is also helpful when transferring pumped milk from a bottle to the bag. Once you pour a little milk in, these bags will basically stand up on their own on the counter. They also come pre-sterilized and ready to go. The sides of the bag are also sealed very well. The top of the bag has a double zipper to ensure an air-tight closing. The bags lay flat even when full of milk meaning they freeze flat to more easily stack when frozen. Of all the great aspects of these bags, perhaps the most appreciated is the milk storage guidelines printed on the front of each bag. For Moms who don’t pump regularly it’s easy to forget what those guidelines are. They appreciated having them there for themselves or anyone else handling the milk.