To make sure all your hard work of pumping your breast milk doesn’t go to waste, you’ll want a storage solution that keeps your milk wholesome and fresh for your baby, for when they need it next.
We’ve researched the best milk storage bags for keeping your breast milk safe, fresh and secure in the fridge or freezer until you’re ready to use it.
Our seven recommendations will make it much easier to get into a feeding rhythm and routine with your baby without the added stress of expired milk and burst bags.
- 180ml bag sizes
- BPA-free and recyclable bags
- Bags don’t have plastic smell or taste
- Recyclable bags
- Fits narrow bottle pump
- Cap seals tightly
- Leak-proof protection
- Resealable bags
- Includes adapter for pumping directly into the bag
- Accurate measurements for tracking what your baby eats
- Safety seals prevents bacteria from entering
- Recyclable bags
- 100% leak-proof due to double zipper seal
- Self-standing bags
- Easy to remove excess air from bags
- Bags don’t burst when overfilled
- Handy pour spout
- BPA-free material
- Stackable space-saving design
- Double zip seals to prevent leaks
- Medical grade BPA-free material
- Our Top Picks
- Why Should I Buy Special Breast Milk Bags?
- How to Choose Breast Milk Storage Bags
- The Best Breast Milk Storage Bags of 2021
- Can I Just Use Cheap Plastic Bags?
- How Do I Use Breast Milk Storage Bags?
- Breast Milk Storage Guidelines
- Storage Bottles vs. Milk Storage Bags
- Breastmilk Storage Bags FAQs
- The Bottom Line
Why Should I Buy Special Breast Milk Bags?
If you are like I was when as a new mom, you might wonder why you can’t just use a ziplock bag that you would find in any grocery store. After all, it would be more convenient, and if you can store adult food in them, shouldn’t they be okay for breast milk?
Here’s why you should pass on the plastic baggies and opt for breast milk storage bags:
- Since ziplock bags were not designed to store breast milk the chances of spills, leaks, or contamination are quite high.
- Milk storage bags are BPA-free, thicker and can be used to freeze, thaw and warm the milk.
- Breast milk storage bags are heavy-duty and sterile, which means your baby has a smaller chance of getting sick from any stray germs.
- It’s much easier to pour milk out of a breast milk storage bag than it is a ziplock bag– many of them have spouts just for that reason.
Breast milk storage bags are also not the same thing as the bottle bags that are sometimes used for feeding. Those bags are much flimsier and aren’t recommended for storing milk – they are only to be used for feeding purposes.
How to Choose Breast Milk Storage Bags
With many different milk storage bags available, there are a few key details you should consider to make sure you find the best for you. The durability, size, material, usability, and option for adapters are all considerations you should make that will narrow down your choices. With this in mind, you’ll find the best bag for your liquid gold.
If you put it in the fridge or freezer and it gets a hole in it, you’re going to be upset. And by upset, I mean ugly crying. Make sure to choose milk bags that are puncture-proof, leak-proof and can withstand being packed in a tight freezer.
Milk storage bags come in a variety of sizes from about four ounces to eight ounces. If your baby is a newborn, you’ll want to go with a small four ounce bag. The more your baby drinks, the bigger the bag should be.
Choose healthy BPA-free plastic and if it’s important to you, look for recyclable bags.
As a busy mom, you want as little extra stuff to think about as possible. We recommend choosing bags that are as easy to use as possible. For instance, choose ones with sturdy seals, double zipper seals or bags that stand upright for your convenience.
A common feature is the ability to pump directly into the bags, making the whole process a lot easier. However, this is usually only supported when using the same brand of the storage bag and breast pump. If you are using a mix-match, check to see if they have their own adapters, or try to find one on Amazon such as this Universal Spectra Pump Adapter.
The Best Breast Milk Storage Bags of 2021
Here are seven great breastmilk storage bags to consider.
1. Lansinoh Breast Milk Storage Bags
These are some of the larger bags on the market, and they have a patented double zipper seal, which means your breast milk shouldn’t end up all over the fridge shelf and any unsuspecting veggies.
It saves you from having to clean up your fridge and pump extra milk to make up for the loss. Lansinoh bags have a pourable spout to help get breast milk into bottles without spilling a drop.
These bags are designed to lay flat in the refrigerator or freezer to save room while storing multiple bags. If you have a Lansinoh pump, you can attach it directly to the bags, or you can purchase one of the adapters if you use a different brand. The bags are also BPA and BPS free.
- It’s easy to tell when the double zipper is closed.
- The bags hold six ounces which is ideal for older babies that take a larger quantity of breast milk.
- These bags are recyclable which protects the environment. You can bring them to the plastic bag recycle center at local stores.
- These don’t have a plastic smell or taste.
- To open these bags to use, you have to tear the top off and open a perforated edge which some women find takes longer than opening other storage bags.
- Moms might not like that these are tricky to stand upright while pouring milk in because they’re made of a thinner plastic than other bags.
2. Kiinde Twist Pouch Breastmilk Storage Bags
If you’re the kind of mom who values convenience above all, these nifty bags might be for you. Halfway between a bag and a bottle, these pouches come with a twist cap that attaches to most breast pumps and the brand’s own bottle converter. They are BPA, PVC, and phthalate-free.
This means you can pump directly into the bag, store it, then attach the bag to an adapter and a range of nipples to feed your baby. No pouring, decanting or measuring out – everything stays in one bag from “boob to baby”!
While quite convenient, an extra benefit of this system is that you’re reducing the chances of bacteria getting into the milk and causing trouble. Plus you’ll cut down on bottle washing, which is always a win.
- The bags are recyclable.
- Fits narrow bottle pump parts, like Medela.
- The cap seals tightly so you don’t have to fiddle with zipper seals and risk leaks and spills.
- Convenient: collect, store and feed all with the same pouch.
- The bags aren’t completely flat and not as easy to store as those with a simpler design.
- Only one size is available.
- The full range with all the accessories may be too pricey for some.
3. Medela Breast Milk Storage Bags
Busy moms who breastfeed understand how hard it can be to transport breast milk. These special milk storage bags are perfect for transporting, whether you have a daily routine or are on a fun family trip.
Made from a durable double-layer material with a double zipper seal, these bags won’t leak and can handle being jostled around in a diaper bag or purse. They stand up on their own or can lay flat, depending on how you’d like to carry them.
One reason we love this set for travel is the included resealable transport pouch, which allows you to carry all of your unused bags and keep them organized and clean. Moms cannot only take breast milk with them but they can pump on the go and know they’ve got a clean bag that won’t leak.
Each bag can hold up to six ounces of breastmilk and each box comes with 100 BPA-free bags.
- Double-layer material and double zipper seal offer leak-proof protection while transporting.
- Bags can stand up or lay flat.
- Includes resealable transport pouch.
- Comes with an adapter to pump directly into the bag.
- You can’t feed your baby directly from these bags, so you’ll need to have other bottles with you for on-the-go feedings.
- On the smaller side.
- Currently not recyclable plastic.
4. Mommy’s Precious Breast Milk Bags
These bags are not only BPA free – they are latex and phthalate free. Mommy’s Precious bags stand up by themselves because of their gusseted bottom design, so you don’t have a struggle filling them up.
They use a double zipper lock for closure and freezing them is simple. They are large and can hold up to 8 ounces of milk. Once filled, they freeze flat to save on storage space.
These bags also claim their measuring lines are 95 percent accurate, which should be a big help to women who are tracking every ounce their child eats.
- The accurate measurements should help moms assess how much milk to pour into each bag.
- The safety seal on the bags prevents bacteria from entering.
- The bags are recyclable.
- Moms may find these bags tricky to open because of the perforation on the bag.
- Although the plastic is thick, it may feel a bit brittle, especially in the freezer.
5. Nuk Seal ‘n Go Breastmilk Bags
These bags also use a double zipper seal, and are guaranteed to be 100 percent leak-proof. Nuk bags have a top seal that prevents tampering and a gusset-free bottom which should mean no leaking from the bags’ corners.
The bags are self-standing, but they can also be stacked in the freezer to save room. The bags hold 6 ounces of milk and when frozen, you simply run warm water over the bags to thaw the milk. Because of the oxygen barrier seal and waterproof design, all you’ll get is pure milk after thawing and pouring into a bottle – not a watered-down mixture.
- Moms may find it easier to get the air out of these bags because they aren’t as thick as some other bags.
- The writing section used for labeling is on the tab, not on the bag like some other brands.
- 100 percent leak proof to the double zipper seal.
- Because these bags are thinner, moms may find that it is trickier to get them to stand upright without a struggle.
- Moms may not like the sometimes strong plastic smell these bags have.
- Not recyclable.
6. Ameda Store ‘n Pour Breastmilk Storage Bags
These bags were made with a multi-ply design to help avoid splits and cracks. Ameda Store ‘n Pour bags have resealable zippers that are easy to close.
They also have a pour spout to cut down on spills. The bags are BPA-free and safe for the freezer. You can pump directly into these bags, but you will need an adapter.
The thick plastic helps the bags stand up on their own and frees you from needing extra arms to get milk transferred into the bags. Ameda bags are also smaller than many others, holding only 5 ounces.
- Moms like that the bags don’t burst if they’re overfilled.
- The handy pour spout allows you to fill a bottle even while you’re holding your baby.
- If you use these bags in the freezer, you won’t be able to freeze the full 5 ounces because the bags don’t have much room left at the 5-ounce line. Some bags contain extra space just for the expansion created when the milk freezes, but these do not. Best to freeze 2-3 oz in these.
- The shape of the bag – the top is smaller than the bottom – makes them difficult to stack evenly.
7. Nanobebe Breastmilk Storage Bags & Organizer
Lead and BPA-free, these bags are also made from a phthalates-free material. This breastmilk storage bag is stackable making it easy for you to organize. Moreover it also has a double zipper seal which makes leaking less likely.
Made of thick, sturdy plastic, these bags hold 5 ounces each and come with a safety seal to ensure the bags haven’t been contaminated before use.
A sizable record panel on top of these bags has a spot for you to write your baby’s name, the number of ounces in the bag, and the date and the time you pumped the milk.
- These bags don’t spill when you’re pouring milk into them because the plastic is so rigid.
- Stackable and great space-saver.
- Only capable of 5 ounces of breastmilk storage.
Other Notable Brands
Other brands that didn’t make the final cut, but we still think are worth checking out are:
Can I Just Use Cheap Plastic Bags?
We don’t think you should pick out breast milk storage bags solely based on price. Instead, look for quality to ensure the ones you pick are meeting all your needs.
Even though they’re just bags, some of them have features that make them better than others. This is why you should consider choosing high-quality storage bags over cheap, inferior brands.
They're Not as Reliable
Whoever made up that old saying, “There’s no use crying over spilled milk” had clearly never pumped their breasts.
While you might be tempted to just use plastic baggies or disposable bottle liners, it’s not a great idea. The CDC advises against this because they aren’t designed to hold breast milk, meaning the chances of leaks or contamination are quite high.
They're Not as Convenient
Superior bags have a design that makes it easy to pour milk into and out of these bags without spilling a drop.
As a new mom, it can feel like you’ve spent half your life pumping only to end up with enough milk to fill a sewing thimble. So you want every last drop accounted for, no excuses.
They're Not as Safe
Unless you’re a compulsive cleaner, the freezer can be a nasty place. Just to be on the safe side, you want to make sure any breast milk you save is tightly sealed in a heavy-duty bag to prevent any cross-contamination from that bag of fish sticks you still have from 2003.
You also need to label the breast milk with a date so you can toss any that expires. The dates also help you rotate your stock by allowing you to put the freshest ones in the back. Some bags have designated writing areas that are in an easy-to-spot location.
How Do I Use Breast Milk Storage Bags?
Before beginning to pump, you should wash your hands, just like you would do if you were preparing dinner for your family (1).
After you’ve finished pumping, take the milk you’ve collected and put it in a storage bag which you’ll either store in the refrigerator or the freezer. All you have to do is open your bag, pour the milk in, and remove excess air before sealing.
If you’ve put 8 ounces of breast milk in a bottle and started feeding your baby, but he’s only able to drink 4 ounces at a time, you have two hours left on this bottle of milk before it should be tossed (2).
If your baby needs more than you’ve given her in one bag, you can simply add more milk to her bottle from another bag. Then you can reseal that bag and put it in the refrigerator again until you need the rest of it. You have 24 hours to use the dethawed frozen milk that has not been mixed with saliva. It saves milk when you give the baby fewer ounces at one sitting, and give more as needed.
Breast Milk Storage Guidelines
- Store milk in the fridge in specially designed glass bottles or BPA-free plastic bags.
- Babies under 2 weeks old need 2 to 3 ounces of milk per bag.
- Older babies need around 3.5 ounces per bag.
- You can keep thawed milk a further 24 hours in the fridge.
- Never refreeze milk.
- Warmer milk has a shorter lifespan. Discard any milk leftover after feeding.
- Babies can have chilled milk only once they’re a few months old.
- Mixing milk from different “batches” is OK if neither is spoiled.
Deciding Which Bag is Freshest
You should label the bag with a date and time to make sure you know when it was pumped. If your fridge is anything like mine, things get shoved around, moved from shelf to shelf and jammed way in the back, so it’s easy to lose track of which one is the oldest bag if you don’t label it.
It’s a simple step that takes the guesswork out of milk storage.
If you plan to bring milk bags to a daycare, you should also write your child’s name on the bag.
I spent a year right after college working in a daycare while I looked for a job and it was unbelievable how many people would forget to put their child’s name on the bag. At any given time in the daycare, there were multiple bags of breast milk in the refrigerator, but there was no way to tell who they belonged to!
Just grab a marker and write the baby’s name on any bags you’re taking outside the house, and the problem is solved.
Storage Bottles vs. Milk Storage Bags
You may be wondering whether you can just store your breast milk in a bottle instead of a bag. The answer is yes, but consider a few key features of bottles before you choose them as a storage method:
- Bottles are durable and less likely to leak.
- Bottles can be sterilized and reused.
- They’re less likely to be contaminated since they can’t be snagged or torn as easily.
- Bottles take up WAY more space in the freezer than bags, and can’t be compressed.
- Bottles are more expensive.
- Milk stored in bottles may take longer to heat up.
Ultimately, it’s your choice. I recommend opting for bottles if you know you’ll be primarily storing milk in the fridge in the short term. If you’re producing a lot of milk or want to keep it frozen for a longer time, bags are the better option.
Breastmilk Storage Bags FAQs
Here are some commonly asked questions about breast milk storage bags to help you in your breastfeeding quest:
Can I Reuse Breast Milk Storage Bags?
One of the most important things to know about breast milk storage bags is that they are not reusable. You use them once, and then you toss them out. No questions asked.
Don’t try to rinse and reuse them, as they’ll no longer be sterile. It isn’t worth taking the chance of endangering your baby just to save a few dollars.
How Long Does Breast Milk Last in the Freezer?
You can safely leave breast milk on the counter, completely unrefrigerated if your room is at 77 degrees Fahrenheit or cooler, for up to 6 hours (3). When stored in the fridge, you can keep breast milk for 5 days, and in an upright deep freezer, breast milk can be stored up to 6-12 months (4). If you’re storing it in the freezer section of your refrigerator, it usually lasts about 3-6 months.
How Do You Unfreeze Breast Milk?
You can thaw it in the refrigerator, which can take around 12 hours, or you can thaw it by running it under warm water while it’s still in the storage bag. Never heat the breast milk storage bags in the microwave. Also note that once the milk thaws, you can’t refreeze it.
How Long is Breast Milk Good After Defrosting?
After you have defrosted breast milk, it can last up to 24 hours if kept in the fridge. You should always defrost the oldest milk first – that way you can minimize wastage.
How Can I Tell if Breast Milk is Bad?
Every mom is scared of giving her child spoiled breast milk. By paying attention to dates and weird smells, you can minimize the chances of giving your baby bad milk.
Smell any milk that’s been in the refrigerator for three days or more. It can certainly last longer than that in the fridge, but it’s wise to start checking it at that point. Breastmilk sometimes does smell after freezing, so you’ll have to figure out what is normal for your milk.
How Many Bags Will I Need?
Every woman’s milk supply is different. Nursing takes some trial and error, but aim to have at least a week’s supply of feeds stored just in case. You can then pump again to replenish the store as you go.
If you’re starting out, begin with about 30 bags and adjust as you get a better idea of your pumping routine. Some women pump every morning for that same day. Others will have excess milk once they return to work and will put everything directly into the freezer. Going back to work, you don’t need to fill an entire freezer – shoot for about 30oz.
Can You Warm Breast Milk in Storage Bags?
Room temperature or body temperature milk is usually best for babies. Thaw frozen milk in the fridge before using. Chilled milk can be warmed by placing in a bowl of warm water (about 99 Fahrenheit) before gently swirling to mix.
Alternatively, a bottle warmer can do the trick. Whatever you do, keep breast milk out of the microwave and don’t boil it, or you risk destroying the milk’s nutrients or scalding your baby.
Can I Use Ziploc Bags?
Honestly, no. I know it’s tempting for the price, and in a pinch, a Ziploc bag could prove to be a good emergency solution. But these bags are not sterile, and nowhere near thick or sturdy enough to do the trick. Trust me on this!
How Do I Label My Breast Milk Bags?
Some bags are going to be tricky to write on, depending on the plastic they’re made from. Ditch ballpoint pens and use a fine-tipped permanent marker. Alternatively, try these fun labels or else get some cheap sticky labels or paper tape from the stationery shop. If you’re feeling creative, you could also identify bags by color-coding them with pegs, decals or paper clips.
What Are the Best Milk Storage Bags for Spectra Breast Pumps?
Try these Spectra pre-sterilized milk storage bags. They’re double-walled, freezer safe and calibrated so you can measure the volume.
What Are the Best Milk Storage Bags for Medela Breast Pumps?
Try these Medela breast milk storage bags. They’re sturdy and come highly rated by other moms.
The Bottom Line
Lansinoh takes the prize as our top pick as the best breast milk storage bag. Despite our best efforts as moms and protectors of our breast milk, spills and leaks are just a fact of life. They will occasionally happen with any brand out there. But the pourable spout and double zipper seal make leaks a rarity with these bags.
Lansinoh bags are the best all-purpose storage bag – they work well in both the freezer and fridge and thaw out easily– and they don’t have that horrible plastic taste or smell. They hold a little more milk than some of their competitors, which is nice for when your baby’s appetite grows.