All About the Willow Portable Breast Milk Cooler

Our patent-pending cooler is your new must-have pumping accessory.

Have you ever been breast pumping on-the-go and realized you forgot a cooler bag, an ice pack, a container for storage, or anything else that might salvage ANYTHING about what you’ve just produced? Yeah, we have. And so have you. And that's why you asked us to come up with something better, something sleeker and something just for you.

Introducing our new patent-pending Willow Portable Breast Milk Cooler—it’s just another way we’re helping moms pump anywhere.

What To Know About Our Portable Breast Milk Cooler

  • Expect your milk to stay cooler longer. Our Portable Breast Milk Cooler will keep your breast milk at a temperature below 15C / 59F for up to 24 hours.
  • Store up to 16 ounces! That’s 3-4 of your pumping sessions!
  • A cooler you'll actually want to carry. The slim design fits in most cup holders and because we know you are always juggling ten things at once, we added a built-in top handle for easy carrying
  • The smart innovation you expect from Willow. We designed our Portable Breast Milk Cooler to protect your milk from potential freezer contamination and make cleaning easier. Pro tip: Do not wash the ice pack in the dishwasher! This is hand wash only.


The Design You Expect from Willow

We take design seriously at Willow, and we know our community of moms expect their product to not just look good, but to function and add value to their modern, fast-paced lives. We spent TWO years (!) from concept to design all the way to manufacturing to bring you a premium product that we know you'll love—based on feedback, surveys and input from our community.

It’s all in the details

  • It fits right into your Willow world. Our team painstakingly worked through color selects to bring you coolers that would pair perfectly with our Pump Anywhere Bag and Case—so you can feel stylish while you pump.
  • It’s ultra-durable. Our cooler is stainless steel, vacuum-insulated, and double-walled so it can tolerate a few bumps and bruises from you and your toddler.
  • It’s leak-proof (just like our Willow 3.0). You won’t ever have to worry about unwanted spills when you're on-the-go

Portable Breastmilk Milk Cooler

Portable Breastmilk Milk Cooler

Store up to 16 oz of milk at a safe temperature for up to 24 hours with our new patent-pending Portable Breastmilk Cooler. 
It's the breastmilk chiller you'll bring everywhere.

The Science Behind The Chill

It’s not just about sleek design it’s also about keeping your milk cool (and what’s cooler than being cool?), so if rigorous testing strategies and things like thermocouples* really float your boat, keep reading. If you don’t want to put your geek hat on, skip to the FAQs below to learn about our new cooler.

Testing, Testing, 1, 2, 3

We worked with a third party independent testing lab to spearhead our safety testing. That means our portable milk cooler was designed and tested to meet Centers for Disease Control and Prevention (CDC) Breast Milk Storage Guidelines and American Breastfeeding Medicine Protocol. So, what did we set out to test? We wanted to answer two questions: If our coolers would bring your body temperature breast milk down to a temperature that is safe for storage, and how long would it keep it at that temperature?

The Discovery

Our Portable Breast Milk Cooler will keep your breast milk at a temperature below 15C / 59F for up to 24 hours.



Frequently Asked Questions

How many ounces of breast milk does the Portable Breast Milk Cooler hold?

Our Portable Breast Milk Cooler holds up to 16 ounces of breast milk. That's 3-4 pumping sessions' worth of milk on average, so you can keep all of your milk at a safe temperature while on the go.

Are the Portable Breast Milk Cooler parts dishwasher-safe?

You can put the stainless steel Portable Breast Milk Cooler vessel and the Lid with Handle into the dishwasher. But DO NOT wash the ice pack. It doesn’t need it!

How do I keep my breast milk cool when out and about?

Our specially-designed insulated cooler with a built-in gel ice pack is designed to keep your milk at a safe temperature. For optimal results, put the ice pack in the freezer for at least 8 hours before use, and ideally up to 12 hours.

What are the dimensions of the Willow Cooler?

The Portable Breast Milk Cooler is 9.5” tall and 3” wide. It fits in most standard cup holders.

Is the Portable Breast Milk Cooler compliant with TSA travel requirements?

Yes! TSA regulations state that any medical necessary gel ice packs are exempt from liquid travel restrictions in any state (eg. melted, slushy), and with or without the presence of breast milk

How long can I store my milk in the cooler?

We have tested our Portable Breast Milk Cooler with an independent third-party lab to ensure that up to 16 oz of milk remains at a safe temperature for up to 24 hours.

Can I put my Portable Breast Milk Cooler in the refrigerator?

If you are planning to store your Portable Breast Milk Cooler in the refrigerator, please note that the frozen ice pack must be inserted in order to keep your milk at a safe temperature. (This may even keep your milk cool longer.) Without the ice pack, your milk may not remain cold enough.

Can my Portable Breast Milk Cooler overheat in a warm room?

We recommend keeping it at room temperature (between 68-72°) to ensure that your breast milk cools properly and remains at a safe temperature.

About Our Editorial Team at Willow

We’re a team of mostly moms who love telling stories about motherhood. We geek out on breast milk composition and the innovation behind our pumps, and love sharing expert-backed tips and guidance to make your feeding journey (and beyond) just a little bit easier. Our hope? To provide moms with a sense of community, confidence, and humor — because this stuff takes a village, and at the end of the day, we’re all just doing our best.
The content provided here is for informational purposes only and is not intended to replace the advice of medical professionals. It should not be used to diagnose or treat medical conditions or problems. Please contact your healthcare provider with questions or concerns.
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