How can i buy the 24mm bags, as the 27mm does not fit my pump correctly and waste milk?

I’m pretty sure there is only one size for all flange sizes. Although I have seen bags that say they are for willow 1&2 generations but I have 3 and haven’t seen a different size to go with each flange.

Will the pump work without the bag attached - I just bought a series 1 because I could not afford 500.00?

If you have the reusable flange than yes it will work without the bags but I have the series 3 so I don’t know about the series 1 and I don’t know if They have a reusable flange that could be purchased instead of bags. As long as you have the correct pieces you don’t have to use the bags for series 3. But you’ll have to check with the one you have. Hope this helps.

If I have a low supply can I put the bags in the fridge in between sessions and use the same bag for the next pumping session ?

No, because you would be mixing the milk at different temperatures. This is one of the only real drawbacks for using the willow pumping bags. For a low supply, I would recommend their reusable storage containers. That way you could pump a little, pour it into a bag or container, and refrigerate it and then on your next pumping session do the same. Then mix your cold containers together to freeze if you want.

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Willow Spill-Proof Milk Bags (1 Pack (48 Bags))

Willow Spill-Proof Milk Bags (1 Pack (48 Bags))

Product ID: 341251474

Details

Brand
Willow
Special Feature
Portable Spill
Item Weight
191 g
Is Dishwasher Safe
No
Style
Compact
Capacity
113 g

🍼4 oz capacity

♻️BPA-free & recyclable

❄️Fridge & freezer safe

Description

🍼 Spill-proof freedom for the modern mom on the move!

SAFE SUSTAINABLE - BPA-free, recyclable materials keep your milk pure and the planet happy.
TRUSTED BY THOUSANDS - 4.6-star rating from over 3,300 moms who won’t settle for less.
ON THE GO CONVENIENCE - Compact, hygienic bags fit perfectly in your purse or cooler for busy lifestyles.
PUMP ANYWHERE ANYTIME - Pump in any position—even lying down or during yoga—without spills.
SEAMLESS PUMP TO STORE - Pump directly into the bag with a unique one-way valve—no transfers needed.

Willow Spill-Proof Milk Bags offer a hygienic, spill-proof solution for pumping and storing breast milk with a 4 oz capacity. Designed for versatile use—including pumping in any position—these BPA-free, recyclable bags are fridge and freezer safe, making them perfect for busy, health-conscious moms who demand convenience and reliability.

Specifications

ASIN	B084YX6FTJ
Additional product features	Portable, Spill Proof
Batteries required	No
Best Sellers Rank	#103,713 in Baby Products ( See Top 100 in Baby Products ) #220 in Breastmilk Containers
Country of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (3,404)
Date First Available	15 November 2019
Dishwasher safe	No
Item Dimensions LxWxH	24.6 x 18.5 x 3.8 Centimeters
Item Weight	191 g
Item model number	B4825
Manufacturer	Willow
Manufacturer recommended age	12 months and up
Model Number	B4825
Product Dimensions	24.64 x 18.54 x 3.81 cm; 190.51 g
Style	Compact
Target gender	Unisex

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