NUK Simply Natural Seal n' Go Breast Milk Bags

I pumped during EVERY nursing session for 5 months straight, in an effort to bank as much milk as possible for my second baby. In that time, I froze and stashed 2500 ounces of breastmilk. With my firstborn I used a variety of different bags, but was having problems with leaking, so I eventually settled on these. So with my new baby, I already knew that these bags would be my go-to for what I was about to attempt. I have used the Nuk bags exclusively the entire time, and went through about 640 bags to get to 2500 ounces when I stopped, and we have had NOT ONE LEAK.I can’t really speak for the measurements on the bag because I didn’t really use them... since the weight of breastmilk itself can vary depending on a number of factors like how much water you drank or fat you consumed that day. I weighed my pumped milk with a small digital kitchen scale and used those weights for my ounce measurements.I never once spilled milk while pouring it into the bag for storage...I held the bag in one hand with the top lip/spout folded down and out of the way, and poured the milk in from the pump bottle with the other hand. Zipped it up and laid it flat for freezing to optimize storage space. Done, zero issues.The most I ever stored in one bag was about 6 ounces, but the majority of my frozen bags held 5 ounces exactly because I estimated that was how much my baby would be eating in one sitting by the time he was 6 months. It also made the most efficient use of the capacity of the bags without pushing their capacity limits, and I could fit 11 five ounce bags snugly into a gallon size freezer ziplock bag (I call them milk bricks), for optimized freezer storage space. By the time I was done I had saved about 48 milk bricks in my freezers.My son is now exclusively drinking my frozen breastmilk, so we have already thawed about 150 of the bags. We place the frozen bag in a bowl of warm water for a few minutes to allow it to thaw and warm, and then pour from the bag into his bottle. The flap/spout at the top of the bag allows us to pour without spilling one drop. Again. Zero leaks during the thawing process.Honestly, these bags were perfect... we definitely put them to the test and they held up beautifully. They were one of the most affordable options available that from my experience ensured the quality I was looking for, and when you’re saving your precious liquid gold that you worked SO HARD to make, you want the most reliable option you can find!100% recommend!

We have twins and are having frozen breast milk shipped to us via fedex twice a week on a combination of wet ice and freezer packs in a styrofoam container (Insulated Shipping Containers, 13 3/4" x 11 3/4" x 11 7/8"; http://www.amazon.com/gp/product/B000ZJSH3I/ref=cm_cr_ryp_prd_ttl_sol_6). The bags were not overfilled and were frozen flat. We found out early that some bags do not hold up well so I ordered every single breast milk bag I could and kept track of how they did (I am a scientist). Here are the results from worst to best (NOTE: this review is most relevant if you are shipping breast milk as fedex is not gentle on packages; if you are not shipping other bags we don't like might be fine but I can tell you which is best overall). Hope you can learn from our experience.Honeysuckle breast milk storage bags: terrible. More than half of these broke during shipping whereas in the same shipment other bag types held up well. I would avoid these.Lansinoh breast milk storage bags: second worst. About 1/4-1/3 of these typically broke/leaked upon shipping. It is not hard to tell they are the flimsiest. P.S. If you use these, a tip I found to help thaw them is to put each bag in a zip lock so it the bag leaks you can still use what stays in the bag (versus what leaks into the ziplock).Medela breast milk storage bags: ok, not great. Hold up better than Honeysuckle and Lansinoh. About 1/6 - 1/5 of these would break/leak. They are also more difficult to pour out of and tend to lose a little milk in the pouring process (trick is to pour fast out of these).Ameda breast milk storage bags: never used them as they come with twist ties and not ziplock seals.Dr. Brown's breast milk storage bags: work great. never had one break. stand up well on their own. very easy to pour out of. Recommended except there is an option just as good and cheaper.NUK/Gerber Seal N Go Disposible Liner: the winner! One bag out of very many has leaked. Stayed intact even when other bags did not survive. Good to pour out of (not as easy as Dr. Brown's but good enough). Thaw well. Better priced than Dr. Brown's (which is why we went with these).

I love these storage bags! I've been pumping and freezing for a little over 6 months now and haven't had a single bag break.I did have one leak due to user error, I was so tired one morning that I wasn't paying attention and didn't fully zip the closures properly... oops! There are two of them though so if you pay attention they will be sealed very well. I am just careful to run my fingers ask the way across once or twice before putting them in the freezer now.I store between 5 and 8 ounces in each bag, lay them flat to freeze, and then stack them in the Nuk freezer storage rack. This system keeps me very organized and it is easy to find what I am looking for.The flaps at the top are plenty big for writing down the date (and time of you pay attention to that) as well as how much is in each bag and there's even a spot for a name in case you are sending these to daycare with your child.The flaps can get in the way during the pouring process if you're not careful - I always fold them down and out of the way when pouring milk into and out of the bags, and that works well.The bags can stand up once you've poured the milk in, but I never rely on this before zipping the bag tightly as they definitely don't stand super sturdily. It's really not hard to hold onto them as you pour and seal them anyway.Overall, a very well made and high quality milk storage bag that I would highly recommend.