I used these bags to store breast milk while exclusively pumping for five months. As an oversupplier, I had a significant amount of milk to freeze, and initially, I had no issues filling or storing the bags.
However, now that I’ve begun using the frozen milk, I’ve discovered that many of the bags have developed holes and are leaking. This is incredibly disappointing and unacceptable, especially considering the time, effort, and care that goes into pumping and storing breast milk.
The loss…
Milk Storage Bags
$
28.99
Free shipping & returns for Babylist orders $45+
FSA & HSA Eligible
1
Let insurance pay for your milk storage bags.
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Overview
Description
Lansinoh Storage Bags feature a double zipper seal to prevent leakage, plus reinforced double-sealed side seams for extra protection. They’re pre-sterilized for safe storage.
To save time, you can pump directly into the BPA/BPS-free bags with a Lansinoh Breast Pump (sold separately) or use another brand paired with the Lansinoh Pump Adaptor (also sold separately).
Tip: when storing milk in the freezer, lay flat for fast freezing and thawing or stand for compact storage.
What we about it
Pre-sterilized bags ideal for storing, freezing and protecting breastmilk.
Details
- Each bag holds 6 oz
- Super strong for storing, freezing and protecting breastmilk
- Double zipper seal for ultimate protection
- Reinforced double sealed side seams
- Presterilized for safe storage, BPA/BPS free
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Q&A
Have a question? Ask an expert.
Start typing and see existing answers.
Can these be used for any pumps?
Best Answer: These can be used with most pumps, but you'll need a Lansinoh Pump Adapter if you're using a Medela, Evenflo, or Ameda pump. For Lansinoh, Spectra, or Motif pumps, no adapter is needed.
What are the dimensions?
Best Answer: These milk storage bags have dimensions of 4.25 inches wide by 6 inches high.
How do you pump straight into the bags?
Best Answer: Simply slide the bag over the Breast Flange Body to start pumping directly into it. For compatibility with other major pump brands, use the pump-into-bag adapter which can be sold separately.
Will insurance cover these? I see on other sites they do?
Best Answer: Check out Babylist.com/heath to see if your insurance is covered.
Do they work with a manual breast pump?
Best Answer: These work with a manual breast pump. You may need to buy an adapter though.
Are these storage bags phthalate-free?
Best Answer: Totally! Lansinoh Milk Storage Bags are BPA, BPS, and Phthalate free.
Are these safe to heat using a warmer from being frozen?
Best Answer: Lansinoh does not recommend warming the bags in a warmer. Their recommended method is to thaw and/or heat under warm, running water or in a bowl with warm or hot water.
Are these reusable?
Best Answer: These Milk Storage Bags are for one-time use only.
Customer reviews
126 Ratings
Customer Photos
1-10 of 126 Reviews
LEAKS
May 13, 2026
Leaks
I’ve lost at least 8 oz due to them leaking, it’s super frustrating cause I try to make sure that the seals are locked but once I put them in the fridge they leak everywhere.
Mar 29, 2026
No adapter needed with my Spectra
These bags are great for storing my expressed breast milk while I'm at work. They fit on my pump flange perfectly without needing an adapter. The only downside is that some of them leak just a little bit. So I freeze them in a standing position instead of flat.
Mar 18, 2026
Poor quality
Just started pulling my freezer milk out and 3 of the 5 bags are broken.
Mar 15, 2026
Bad seal
I loved these bags when I was filling them with milk and putting them into the freezer because of how flat they froze. I have started using that frozen milk for my almost 1 year old and I guess I got a bad batch, but I have lost 4 bags of milk in 1 day due to the seals on the side having a hole. I also can’t tell until it is thawing/thawed when milk is everywhere or gone. This is extremely frustrating because I had worked very hard pumping and breastfeeding and only had enough milk to get my…
Jan 11, 2026
Leaky and low quality
At least half of the bags I had stored leak in the lower corner near the joint of the bottom and the side. I tried thawing bags upside down (with the seal down in the water to save some milk), but my baby will not accept milk from the leaky bags. The milk also smells weird on these bags that leak. I emailed customer service and they issued me a $15 amazon gift card. Nearly half of all milk bags that I’ve tried to thaw have leaked. I can’t even buy formula to replace the lost milk for that. I…
Dec 16, 2025
New design loses some ease of use
The new design seems cheaper than the old. The perforation at the bags opening is flimsy and results in ripping the top of the bag when you go to pull off the seal (this never happened with the old design). Also the new bags do not sit vertically as easily when you pour milk in. I was used to the old bags which sit easily on my counter as I pour and with the new bag, it immoderately toppled over as I started pouring and in early lost 5oz!
I’m thinking lansinoh wanted to save money with the new design but have now put out a crappier product.
I’m thinking lansinoh wanted to save money with the new design but have now put out a crappier product.
Dec 2, 2025
New breastmilk storage bags
We all know the feeling of spilling even a drop of milk. These new storage bags have spilled my milk twice from a hole at the side of the bags. I literally shes a tear as almost 2 ounces of milk spilled and I didn’t notice it. It’s too plasticy for me. I prefer the old bag way better.
Nov 8, 2025
Wanted to love but not the case
I bought these a week ago and I have already had milk spill 3 times they do not hold up for a second. It’s truly annoying
Sep 17, 2025
Perfect ,, definitely good quality
Aug 13, 2025
