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The Best Breast Milk Storage Bags of 2020

Breast milk is full of all the nutrients your baby needs in their first year of life. It’s also full of healthy fats critical to brain development, antibodies that boost your baby’s immune system, and countless vitamins.

Many refer to breast milk as “liquid gold” for this reason.

Breast milk storage bags will prevent spilling a single drop of this liquid gold after pumping. The best breastmilk storage bags make it easy to transition to a bottle for feeding and protect the nutritious liquid inside from freezer burn and contamination.

Here’s a look at the top breastmilk storage bag choices. 

Best Breast Milk Storage BagWhy It's BestMom Rating
Spectra Baby USA Disposable Breast Milk Storage BagsCan pump directly into these uniquely designed bags♥♥♥♥♥
Medela Breast Milk Storage BagsCompatible with Medela pumps and freeze flat for more storage♥♥♥♥♥
Lansinoh Breastmilk Storage BagsPre-sterilized with double zipper and the ability to pump directly into the bags♥♥♥♥♥
Kiinde Twist Pouch Breast Milk Storage BagsPump, freeze, and feed all from the same container♥♥♥♥♥
Eccomum Breastmilk Storage BagsEasy pour spout and big capacity make pouring into a bottle easier♥♥♥♥

Best Breast Milk Storage Bags

Spectra Baby USA – Disposable Breast Milk Storage Bags

Image of the Spectra Baby USA - Disposable Breast Milk Storage Bags - 30 Count

The Spectra Baby USA – Disposable Breast Milk Storage Bags – 30 Count comes with all the basic features you’d want in a breast milk storage bag. They feature a double-lined seal that tightly locks your breast milk inside so you don’t have to worry about leaks or contamination. 

Each bag can hold up to 200mL or 7 ounces. There is a clear label on the outside of the bag that you can watch fill up so you know how many ounces are in each bag. Additionally, there are areas to write the child’s name when needed and the date so you can use the bags in a timely manner. These also stand up by themselves, which makes them easier to store or set in the fridge for thawing. 

Each bag is made from BPA/DEHP-free plastic. Additionally, parents can find comfort in the fact that Spectra Baby USA is run and owned by moms, including registered nurses, board certified lactation consultants, and more. With their personal experience, they know what moms need. 

Something to note is that you cannot pump directly into these bags. Additionally, for the measurement scale to work, you will need to be sure the bag is sitting with the sides expanded. Otherwise, it will read that there are more ounces in the bag than there actually are. 


  • Made of BPA/DEHP-free plastic 
  • Come pre-sterilized and ready to use 
  • Clear area for labeling 
  • Double zipper and double-lined to protect the milk
  • Stands up on its own
  • Holds up to 7 ounces of milk 


  • Can be hard to get an accurate reading of the ounces in the bag 
  • Cannot pump directly into the bag 

Medela Breast Milk Storage Bags

Image of the Medela Breast Milk Storage Bags, 100 Count, Ready to Use Breastmilk Bags for Breastfeeding, Self Standing Bag, Space Saving Flat Profile, Hygienically Pre-Sealed, 6 Ounce

The Medela Breast Milk Storage Bags, 100 Count come pre-sealed so you can be sure no contaminants have gotten into the bag. You tear off the perforated top of the bag and then a double layer of material keeps breast milk safe from leaks, air, and contamination. 

These bags have a double-zipper on top that seals well and prevents leaks, even if you lay them flat in the fridge. Their ability to lay flat means that the bags take less space in the freezer. Additionally, they thaw faster when you move them to the refrigerator. 

The Medela breast milk storage bags also stand up on their own, which makes it more convenient to handle when you are preparing bottles. Like most other bags, the measurements are slightly off on this so it might be best to measure the breast milk and mark it on the bag instead of relying on the measurements on the bag.

The other downside is that the top of the bag can tear uneven and that makes it harder to pour the contents from the bag into a bottle without losing any breast milk. 

Being made of BPA-free, food-grade materials, these work as well as any other breast milk storage pouch. They can also be used with an adapter so you can pump directly into the bag. As an added bonus, the company includes a resealable, reusable transport pouch that lets you keep several bags clean and organized when you take your baby away from home. 


  • Made of BPA-free, food-grade plastic 
  • Double layers for added protection
  • Comes pre-sealed for extra protection from contaminants
  • Lay-flat design
  • Self-standing 
  • Comes with resealable, reusable transport pouch


  • Measurements are inaccurate 
  • Hard to pour from the bag without spilling

Lansinoh Breastmilk Storage Bags

Image of the Lansinoh Breastmilk Storage Bags, 100 count

The Lansinoh Breastmilk Storage Bags, 100 count come pre-sterilized with a double-zipper to keep contaminants out and keep breast milk in. These are designed to work directly with Lansinoh breast pumps or you can use an adapter to make the bags work with most other pumps as well. By pumping directly into the bag, you are wasting less breast milk. 

Each bag is made of BPA- and BPS-free plastic that has been pre-sterilized. With double-sealed side seams, there’s a lower risk of leakage and better protection from freezer burn and contamination. These also have a double-zipper seal to lock breast milk in and contaminants out. Additionally, the bags are made with a softer plastic that makes it easier to remove the air before sealing. 

The Lansinoh bags stand up on their own, however, they also lie flat. This allows them to be stored in a more space-efficient way and reduces the time that it takes the bags to thaw. The easy-pour spout also makes it convenient to transfer to a bottle once thawed and you can easily write important information on the label. Lansinoh breast milk storage bags have a more accurate reading of the ounces in the bag as well. 

This is another mom-founded company that parents can feel confident buying from. As an added benefit, many of Lansinoh’s products are FSA- and HSA-eligible for mothers that can get reimbursement for their breast pumps through their health plan. The one downside is that these hold a maximum of 6 ounces, which may not be enough once your child is older. 


  • Pre-sterilized
  • Soft plastic lets you remove air before sealing
  • Easy pour spout so you don’t have to worry about spills when transferring milk
  • Easy to write on the bags 
  • Lie-flat design
  • Stands up on its own
  • Lansinoh products are generally FSA- and HSA-eligible


  • Only holds six ounces 

Kiinde Twist Pouch Breast Milk Storage Bags

Image of the Kiinde Twist Pouch Breast Milk Storage Bags for Pumping, Freezing, and Feeding

The Kiinde Twist Pouch Breast Milk Storage Bags for Pumping, Freezing, and Feeding features a twist-on design that ensures you don’t lose a single drop when attaching to your breast pump. This is designed to work with the Kozii bottle warmer to thaw and warm the bottle before snapping into the Kiinde Squeeze Natural Feeding Bottle. This makes this the perfect choice for mothers who are looking for a storage pouch that they can feed directly from, reducing the risk of losing any milk. 

With a threaded cap, this has a lower risk of leaks even when freezing and thawing the milk. The pouches are made from pre-sterilized recyclable materials, which is great for mothers trying to reduce their impact on the environment. It is available in 6-ounce or 8-ounce sizes which lets you adjust the amount based on your child’s age and how much they typically eat in a serving. 

Since you can feed directly from the pre-sterilized bag, there’s a lot less sterilization that goes into using this feeding system. All you have to sterilize are the nipples that attach to the bag. These also take up less space because they’re designed to lie flat during storage. 

The Active Latch nipples recommended to be used by this brand are designed to mimic the shape of the nipple. They are soft and textured, making it easier for your little one to latch. Additionally, the oval design minimizes airflow, which can help reduce colic. 

You can easily write on these bags. Something to note, however, is that the measurement markings are a little bit off. This is problematic since you do not use these with bottles that can give you an accurate reading. These are also a little more expensive, however, that’s likely because of the convenience and extra features that come with the twist-on top. 


  • Work as part of a feeding system
  • Can pump, freeze, thaw, warm, and feed from the same bag 
  • Nipples designed to work with the system mimic the breast and minimize colic 
  • Pre-sterilized 
  • Comes in 6-ounce and 8-ounce sizes 
  • Lies flat to save space 


  • Measurements are off 
  • More expensive than other breast milk storage bags 

Dr. Brown’s Breastmilk Storage Bags

Image of the Dr. Brown's 100 Piece Breastmilk Storage Bags

The Dr. Brown’s 100 Piece Breastmilk Storage Bags features an extra-thick design for freshness and a double-zip that keeps breast milk fresh. These BPA-free bags also come pre-sterilized so they are ready to use right out of the box. 

You’ll need to tear the top off of these before using them, as they have been sealed to ensure there is no contamination. The top is perforated so they’re easy to tear and there is an exterior trim that cushions the milk and prevents leaks even if the bag is dropped. 

The design of the bottom allows these bags to stand on their own, making it easier to get them ready for feeding. There is also an area to label the Dr. Brown’s breast milk storage bags with information like the date and your baby’s name. These only hold six ounces, which may not be enough once your child gets older if they eat a lot in a single feeding. 

While the thicker design is nice for protecting your breast milk from freezer burn, especially if you are trying to prepare a large stockpile of milk, they are less flexible. This makes it harder to put the milk in the bag and to pour from the bag to the bottle. The labels are semi-accurate for measuring the number of ounces in the bag. 


  • Thick design ensures freshness 
  • Pre-sterilized and ready to use 
  • Perforated top for an easy-open
  • Stands up on its own 
  • Mostly accurate measurements 
  • Easy to write on the bags 


  • Plastic is not very flexible 
  • Only holds six ounces 

NurtureRight Breastmilk Storage Bags

Image of 100 Breastmilk Storage Bags - 6oz / 180ml Pre-Sterilized & BPA-Free Bags, Designed for Even and Faster Thawing with Leak Proof Mechanism by Nurture Right, New & Improved

The NurtureRight- 100 Breastmilk Storage Bags are BPA-, latex-, and phthalate-free. You have to tear the top off as these come pre-sterilized and ready to use. Something to note is that these have one of the more accurate measurements of breast milk when standing because of the way the bag is designed, however, you can still lay them flat for feeding. 

Like many others, this features a double-zip seal that locks out contaminants and keeps your breast milk fresh. The lay-flat design means they take up less space when storing and also thaw faster when you pull them from the freezer. They are also easy to write on which is perfect for writing important information like the number of ounces of breast milk and the date the milk was stored. 

Another nice feature for parents who aren’t sure how they’ll feel about these bags is that they come with 100% money-back guarantee. It’s always nice when a company stands behind their product with a guarantee. 

Some parents have struggled opening the zip-top the first few times. If you pull it apart as you normally would a zip-top bag, it can cause it to separate from the side of the bag and make the seal useless. After you get the hang of it, however, these work as well as any other bag.

One other downside is that these do not work with any adapters, so you cannot pump directly into the bag. 


  • Free of BPA, latex, and phthalates
  • Double-zip to lock out contaminants 
  • Lies flat in the freezer and during thawing 
  • Comes with 100% money-back guarantee
  • Pre-sterilized 
  • Self-standing design
  • Accurate measurement of breast milk when the bag is standing


  • Zip-top can separate from the bag if you open it wrong 
  • Does not work with any breast pump adapters 

Eccomum Breastmilk Storage Bags

Eccomum Breastmilk Storage Bags, 100 Count, Self Standing Bag, Easy Write-on Label, Spout & Thickened Design, Double Zipper Seal, Fits All adapters, BPA and BPS-Free

The Eccomum Breastmilk Storage Bags features a spout that makes pouring milk into a bottle easier, which is perfect for moms who hate struggling with zip-tops that are not designed to pour directly into the bottle. While the top features a double zip-top, there is also a spout on the side that you cut open once the milk is thawed and easily pour into the bottle. 

These breast milk storage bags are free of latex, BPA, and BPS. They come pre-sterilized so you can use them right out of the box. Additionally, there is an enhanced zip-lock at the top of the bag that locks contaminants and air out, keeping breast milk safe and fresh. Also, they fit all breast pump adapters too. 

The self-standing design makes these easier to use when pouring milk into the bags. Eccomum breast milk storage bags also lie mostly flat, depending on your storage preference. You don’t have to worry about leaks because of the double-sealed and reinforced side seams. Each bag holds up to 8 ounces and you can label these with information like the date, amount of milk, child’s name, and other pertinent information. 

This company provides 100 bags at an affordable price. Also, the bags are heat resistant to help make it easier to heat the milk before putting it in the bottle. 


  • Easy pour spout on the side
  • Free of latex, BPA, and BPS 
  • Enhanced zip-lock and double-sealed sides to prevent leaks 
  • Self-standing design 
  • Lies flat for storage and thawing 
  • Easy to label 
  • Holds up to 8 ounces 


  • If the spout tears it can leak a ton of milk

Unimom Thermal Sensor Breast Milk Bags

Image of the 60 Thermal Sensor Breast Milk Bags Shows when Milk is Frozen, Cold or Hot - Self Standing, Zip Top, Leak Proof, Freezer Safe Pre Sterilized - BPA Free 7oz by Unimom

The Unimom 60 Thermal Sensor Breast Milk Bags features a unique thermal sensor that lets you visually monitor how hot or cold the breast milk is, making feeding time easier. These hold up to 7 ounces of breast milk and are made of durable, BPA-free plastic material. 

Like many others, these breast milk storage bags feature a zip-lock closure that helps you seal the breast milk inside and protect it from contamination. It comes with durable side seams that prevent leakage and spilling. Additionally, each bag is pre-sterilized so it is ready to go out of the box. 

This also features an area to write in important information about the breast milk, however, the writing area is a little small. A smaller writing area can make it harder to write in information if you are trying to be especially detailed, like you might if you are sending breast milk in with your child to daycare. Like many others, this does not measure the amount of milk in the bag very accurately. 

When you are ready to thaw for feeding, simply put the bag in a bowl of warm water. There is a blue thermometer-shaped indicator on the bag that will turn white when the milk is ready for your child to eat. This also features a lie-flat design to thaw faster or it stands up on its own, which is more convenient when preparing bottles. 


  • Free of BPA and other harmful plastic contaminants
  • Comes pre-sterilized 
  • Zip-lock closure to seal milk in
  • Double-sealed side seams 
  • Comes with a thermal sensor so you know when milk is ready
  • Lie-flat or self-standing design 


  • Labeling area is very small
  • Does not measure the amount of breast milk accurately 

Philips AVENT Breast Milk Storage Cups

Image of the Philips AVENT Breast Milk Storage Cups, 6 Ounce (Pack of 10)

The Philips AVENT Breast Milk Storage Cups, 6 Ounce is a great choice for mothers looking for a more eco-friendly way to store their milk. This set comes with 10 6-ounce storage cups and lids that stack easily together to save space and an adapter that makes it easy to pump directly into the container. 

These containers are dishwasher safe and made from BPA-free plastic. The lids twist on for a tight seal that won’t leak if the container tips over. You can also easily write information about the serving size and date on the smooth plastic surface. 

As an added benefit, you can also use the Philips Avent nipples to feed directly from the storage container. This means that whether you are pumping, storing, or feeding, you never have to transfer the breast milk. You can also use these in the bottle sterilizers and warmers. 

Something to note is that it is a little difficult to thread the lids on properly. You’ll want to set these down on a flat surface and be sure the lid is sitting flat to avoid leaks. 


  • Pump, store, and feed from the same container
  • Containers are dishwasher safe and reusable
  • BPA-free
  • Creates less trash for the planet
  • Containers stack together to save space
  • Easy to write on


  • Can be difficult to thread the lid properly to avoid leaks

Buying Criteria for Breast Milk Storage Bags


Some breast milk storage bags are designed to screw onto specific pumps so you can pump directly into the bag. If you already have a breast pump, check for compatibility as you’re looking at different storage bags. If you don’t have a breast pump yet, you can check out this article for our recommendations on best breast pump.

As some bags are designed to be used with bottles or bottle warmers, you can also check for compatibility with these to make your life easier. 


Many breast milk storage bags come pre-sterilized, which guarantees they are free of any contaminants they might have picked up from being handled or during the manufacturing process. This ensures your little one’s milk stays free of any bacteria or other contaminants that might make them sick.

Some bags also come pre-sealed. If they do come sealed already, you’ll want to be sure it’s easy enough for you to tear them open that you are not struggling when you’re trying to use the bag. 

Having a proper seal is also important to the overall hygiene because if air gets in the bag during storage, the milk can become contaminated. Some bags seal using a double zipper while others make use of a screw top. 


A major goal in using breast milk storage bags is making sealing, storing, and using your milk easier.

One convenience feature that some bags have is the ability to stand up. When they are designed to stand up on their own, it makes it easier to set them on the counter while you prepare the bottle or in the refrigerator while they are thawing out. 

Another thing that makes bags more convenient is how they are labeled. Some bags have markings to help you measure the number of ounces of milk stored. This makes it easier to feed your baby based on how much they eat at a typical feeding. Other labels might have an area for you to list the date or other important information. This helps you ensure that you are using the oldest breast milk in your supply first. 

Something to note is that even though many bags feature labels that show the number of ounces in the bag, they do not have accurate readings. The plastic material breast milk bags are made from is flexible. It makes it harder to get an accurate reading because the bag may be more or less expanded than it was when the ounce information was printed. The best way to get an accurate reading is to measure the milk before putting it into the bag and then marking the accurate number of ounces yourself. 


Breast milk storage bags are typically made from thick, food-grade plastic. It’s important to choose a brand that is made from 100% BPA-free plastic. Additionally, you may want to look for bags that have been heat-sealed at the seams because they are stronger and less likely to split at the seams or develop leaks. 

It is not uncommon for bags to have double layers. The extra layers protect your liquid gold from spoilage and help prevent leaks. 

FAQs About Breast Milk Storage Bags

What are the best breast milk storage bags?

As with many baby products, there are dozens if not hundreds of options to choose from when you’re trying to find the best breast milk storage bags.

This list of reviews should have helped you narrow things down to some of the leading choices by top brands including Lansinoh breast milk storage bags, Medela breast milk storage bags, Nuk Seal ‘n Go bags, and many others.

What matters most is that you choose a storage bag compatible with the pump you’ve chosen. It should seal properly and be designed in away that prevents leaks and spills.

Additionally, you’ll want to choose a breast milk bag that is free of harmful substances like BPA and that will protect the milk from freezer burn and contamination. 

How long can I store breast milk in breast milk bags? 

The shelf life of breast milk stored in breast milk storage bags depends on the storage environment.

If you are storing breast milk at room temperature, you should use it within four to six hours, unless it is especially hot and then the limit is four hours.

Breast milk stored in an insulated bag with an ice pack is generally good for a day, which makes this the best way to travel with breast milk.

Refrigerated breast milk can be stored for up to five days toward the back of the fridge where the temperature is coldest and remains consistent. However, you should move the bags after a maximum of three days if you plan on freezing them.

Finally, frozen milk can be stored for up to 12 months in a deep freezer and six months in a normal freezer as a general guideline. 

Something to note is that experts recommend using breast milk sooner rather than later. It loses Vitamin C the longer it is stored. 

Should I use breast milk storage bags? 

It’s important to store breast milk in food-grade containers. You can use plastic containers designed for this purpose with tight-fitting lids or breast milk storage bags.

The advantages of breast milk storage bags are that they lie flat and can conserve space when refrigerated or frozen. Some are also designed to work with bottle warmers or can be put right inside bottles for drinking, so you don’t have to waste a single drop.

Additionally, you know that breast milk storage bags are already pre-sterilized and come in food-grade containers. Many of them have labels that measure the number of ounces and allow you to record information like the date that the milk was stored. They are also relatively affordable so you can buy as many as you need.

However, for moms looking for a more eco-friendly option, we recommend something like the Philips AVENT breast milk storage cups mentioned above. 

How many breast milk bags do I need?

It can be hard for new mothers to decide how many breast milk storage bags they should buy to get started, especially if they are inexperienced with breastfeeding and pumping.

As a general guideline, you’ll need one bag for each side when you pump, so two bags for each time you pump. Many mothers start by pumping overflow just once per day, which means that you’ll need 60 bags for 30 days. Mothers who are going back to work or pumping more frequently might need more bags than this. 

Something to note is that you only need to add as much milk to breast milk storage bags as your baby drinks in a feeding. Once the breast milk has been prepared, it should be used or discarded to avoid germs. This means that any liquid not finished goes to waste.

Additionally, you should avoid filling the storage bags completely because breast milk expands when it is frozen and it can cause the bag to rip at the seams if it is too full. 

Can I store breast milk in Ziploc bags?

You should never use Ziploc or other plastic baggies to store breast milk.

Even though many of these bags are food-grade and even able to be used in freezers, they are not designed to hold liquids without leaking. There’s no guarantee that breast milk will not leak from these bags.

It is also harder to transition the milk into bottles from Ziploc bags than from the bags designed to hold breast milk, as many breast milk storage bags have spouts designed especially to make transitioning the milk from bag to bottle effortless. 

How should I thaw frozen breast milk in storage bags? 

The safest way to thaw frozen breast milk is by moving it from the freezer to the fridge the night before you plan on using it. However, you might forget to do this or you may need to thaw them quickly if you have to leave your baby with a sitter unexpectedly.

If you need to thaw faster, the safest way is to thaw is using warm water, either by running it under water from the tap or setting it in a container of warm water. You should not use the microwave to thaw breast milk because it can create hot spots from uneven heating. 

The oldest breast milk from your supply should always be used first. Create labels or write on the breast milk storage bags with at least the date so you can properly store and use the milk.

Something to note is that thawed breast milk might have a different smell than it does when it is fresh. You cannot use the smell or color to determine how “good” the milk is since breast milk can vary in smell and color depending on what the mother eats, especially after being frozen.

As a general rule of thumb, it is recommended that you use thawed milk within 24 hours. 

Can I wash and reuse breast milk storage bags?

You should never reuse breast milk storage bags.

Breast milk storage bags come pre-sterilized, which means the bags are free of any type of contaminants that could ruin the milk or harm your baby. Even washed bags cannot be guaranteed sterilized and free of contaminants. Additionally, there is a risk of tearing small holes in the bag, especially in the seam. This can cause leaks and puts the milk inside at risk for spoilage as well.

There are no reusable breast milk storage bags. Once they have been used, bags are not sterile any longer and there are no boiling or washing procedures that safely restore that sterilization.

For mothers looking for a more eco-friendly option, it is better to store breast milk in reusable food-grade containers or sterilized bottles. However, containers and bottles have the downside of being more expensive. They are also bulkier, so you won’t be able to store them as easily if you are low on space in the refrigerator and freezer. 

However, knowing that there is a higher demand for eco-friendly options today, some companies have stepped up in making breast milk storage cup options. 

Final Word

Finding the best breast milk storage bag is about choosing what works best for you as a parent. However, you want to choose a brand that won’t leak and waste your precious milk. Factors like convenience, how easy it is to write on the bag, and compatibility with your pumping system might also influence your decision.

My top choice when my littles were younger was Lansinoh Breastmilk Storage Bags, simply because I used a Lansinoh pump and it was easy to attach the bags, pump, and freeze. They had all the features I needed at the right cost and were easy to use.

Hopefully, this guide has been helpful for finding the right breast milk storage bags for your family, too. 

Samantha Davis
Samantha Davis
Samantha Davis is a part-time writer and a full-time mommy of two boys, Apollo (age 3) and Adrien (age 5). She has been working as a writer for five years and one day plans to run her own writing company. For now, Samantha is content working as a writer and spending all her free time with her little boys. They live together with dad in Ohio and spend their free time crafting, hiking, and baking.

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