Breast Milk Storage & Thawing Guide | Willow

How to Store Breast Milk:
The Complete Guide

How to Store Breast Milk: The Complete Guide

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How long does breast milk last?

How to thaw & warm safely

How to store breast milk on-the-go

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Meet the Breast Milk Cooler

Featuring two ways to cool - ice cubes or an in-bottle ice core that lends itself to sanitary milk transfers - this unique design cools breast milk faster and keeps it cooler longer vs. leading milk coolers.*

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*Compared to leading milk coolers in Eurofins 2026 controlled, third-party testing

The future of breast milk storage is here

Durable, leakproof, self-standing milk storage bags, now with scannable SmartStash™ technology.

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New

HSA/FSA

Breast Milk Cooler

Meet the Breast Milk Cooler that cools faster and stays colder for up to 24 hours vs. leading milk coolers.* Plus, with new sizes, colors, and two ways to cool, this patent-pending Cooler safely and stylishly lets moms store milk wherever the day takes them.
*Compared to leading milk coolers in Eurofins 2026 controlled, third-party testing

from $39.99

Unit price: per

Smart Storage Bundle

Put your breast milk organization on autopilot. Featuring our premium Breast Milk Storage bags with SmartStash capability–a unique scannable code that lets you auto-input and track bags in your digital stash–and Flatteners to evenly organize and freeze your physical stash, this combo does the mental math for pumping moms.

$35.98

Unit price: per

New

HSA/FSA

Breast Milk Bag Flatteners

Optimize breast milk storage with our new Breast Milk Bag Flatteners, designed to help you neatly and efficiently organize every last drop.

$24.99

Unit price: per

Breast Milk Storage Bags with SmartStash™ Tracking

New

HSA/FSA

Breast Milk Storage Bags with SmartStash™ Tracking

Same high-quality bag, new top-quality tech. Our durable, leak-proof bags are now designed with a scannable, AI-enabled code to auto-input your milk bag information into your digital stash in the Willow app. However you choose to pour and store, you’ll finally have the control and peace of mind you crave.

from $10.99

Unit price: per

Glass Breast Milk Pitcher (32 oz)

Designed to simplify fridge storage, make milk transfer mess-free, and help you combine your pumped milk throughout the day.

$19.99

Unit price: per

New

HSA/FSA

Breast Milk Cooler Ice Pack

Designed to fit inside both 16 oz. and 25 oz. Coolers, the Breast Milk Cooler Ice Pack fits inside the Cooling Cup to keep breast milk safely chilled for up to 24 hours. Use as a back-up so you’ve always got a frozen pack on deck, or as a replacement.

$14.99

Unit price: per

Glass Breast Milk Pitcher Duo

Bundle up with two of our glass milk pitchers, to help you combine your pumped milk throughout the day.

$39.98

Unit price: per

We believe moms deserve better.

Since creating the first fully wearable pump, we’ve continued to innovate in ways that always put moms first, helping extend the breastfeeding journey with more freedom & less compromise.

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