How can I prevent Lansinoh bags from leaking during thawing?

Freeze flat, avoid stacking until frozen, thaw in a bowl or ziplock bag to catch leaks, and handle gently to avoid punctures.

Are the new Lansinoh bags worse than the old ones?

Many users say yes, reporting that the new bags are thinner, leak more, and have inaccurate measurements compared to the previous version.

Which brand is the best alternative to Lansinoh?

Medela is frequently mentioned as more leak-resistant, while Target Up&Up and Kiinde are also alternatives, each with their own trade-offs.

Lansinoh

New Lansinoh Breastmilk Storage Bags (150-Count)

$17.99$25.98-31%

In Stock

Lansinoh Breastmilk Storage Bags (150-count) are pre-sterilized, BPA/BPS-free bags designed for storing and freezing breastmilk. Each bag holds up to 6 oz and features a double zipper seal and reinforced side seams for leak resistance, and can be used directly with Lansinoh pumps. Note: This package contains 150 bags instead of the standard 200, and some user reviews report potential leaking and inaccurate volume markings, so handle with care.

Material: BPA and BPS-free plastic
Gender: unisex
Category: Baby & Toddler > Nursing & Feeding > Breast Milk Storage Containers

View on merchant site JSON

GTIN: 044677204835
MPN: LANSINOH-044677204835-NEWOVERSTOCK-150OF200

Specifications

Safe, secure breastmilk storage bags designed for freezing and storing breastmilk. Features a double-seal zipper, reinforced seams, and a teapot-style spout for easy pouring.

Helps protect breastmilk nutrients; super strong and durable with reinforced double-sealed seams and double zipper; presterilized and safe, BPA and BPS-free; new color-changing double zipper for visible secure closure; updated teapot-style spout for easy one-handed pouring; compact storage by laying flat for ultra-fast freezing and thawing.

Material: BPA and BPS-free plastic
Gender: unisex
Age Group: infant
Condition: new
Category: Baby & Toddler > Nursing & Feeding > Breast Milk Storage Containers

Additional Attributes

super strong and durable
double-seal zipper
reinforced seams
teapot-style spout for easy one-handed pouring
presterilized
BPA-free
BPS-free
color-changing zipper for secure closure
ultra-flat design
freeze-flat for compact storage
compact storage
pump directly into bag
6oz capacity
helps protect breastmilk nutrients

Image Analysis

4 images

01high: Top portion of a clear resealable storage bag containing pale beige liquid, showing a purple brand name 'Lansinoh', a purple floral graphic, measurement markings, and a write-on label panel under the zipper.
OCR: NAME. DATE. TIME. VOLUME. TO PUMP INTO BAG INSERT PUMP OR ADAPTER TO LINE. REMOVE AIR BEFORE SEALING - FREEZE FLAT - MADE WITHOUT BPA/BPS. Lansinoh. MAXIMUM 180 6. 150 5. 120 4. 90 3. 60 2. 30 1. ML fl oz
clear flexible plastic bagresealable zipper closure with double trackrectangular write-on label panel with preprinted fieldspreprinted fields: NAMEpreprinted fields: DATEpreprinted fields: TIMEpreprinted fields: VOLUMEpurple printed brand text 'Lansinoh'purple floral flower graphicvertical measurement scale with numbers and tick marksprinted instruction text line under zipperpale beige liquid inside bagtransparent lower bag bodystudio white backgroundeven studio lighting
02high: Studio product image of a clear resealable Lansinoh breast milk storage bag standing on a white pedestal with headline text to the left and a purple award badge at top left.
OCR: what to expect. FEEDING AWARDS 2025. Protects Essential Breastmilk Nutrients. Lansinoh. MAXIMUM 180 ML
clear plastic resealable storage bagtranslucent bag bodypurple printed logo text 'Lansinoh'purple floral icon printblue double zip sealwhite writable label area at topmeasurement scale with numeric markingshang hole tab at bag toprounded pedestal platformbeige studio backgroundpurple circular award badgelarge headline text on backgroundsoft studio lighting and shadow
03high: Close-up of two hands holding and stretching the top of a clear milk storage bag filled with milk against a beige background with headline text and a purple badge.
OCR: #1 SELLING MILK STORAGE BAGS. Superior Strength & Stretch. *Circana & Profitero L26WE 5/18/2025
human handpainted fingernailsclear plastic storage bagwhite liquid (milk) inside bagpurple floral graphic on bagpurple volume measurement markingssealed top edge of bagbeige solid backgroundlarge serif headline text in imagecircular purple badge
04high: A rigid translucent plastic dispenser with purple rims holding stacked flat freezer storage bags; a hand is pulling a sealed bag from the top. Text on the image reads Freeze-Flat Design. For space-saving storage.
OCR: Freeze-Flat Design. For space-saving storage
rigid plastic dispenser casepurple plastic rimtranslucent white container bodystacked flat freezer storage bagszipper-seal on bagmeasurement markings on baghand pulling a bagbeige studio backgroundsoft studio lightingshadow under productprinted label area on bags

Brand PDP Lookup

Brand: Lansinoh
URL: https://lansinoh.com/products/breastmilk-storage-bags

Lansinoh Breastmilk Storage Bags | Breastmilk Freezer Bags

Documents & Data

Reddit Insights

6 threads · r/breastfeeding, r/ExclusivelyPumping

Reddit users are mixed but largely negative about the 'new' Lansinoh breastmilk storage bags, citing serious leaking problems and inaccurate measurements, though some still find them acceptable with careful handling and prefer them over certain other brands.

negative sentiment98% match

The majority of comments express frustration with leaking and measurement issues, though a minority report no problems or prefer Lansinoh over Medela, leading to an overall negative sentiment.

Themes

Leaking and breakage during thawing/freezingnegative

Inaccurate volume measurementsnegative

Comparisons with other brands (Medela, Target Up&Up, Kiinde)mixed

Freezing and thawing techniques to prevent leaksmixed

Use Cases

Storing and freezing breastmilk for later use
Pumping directly into bags using adapters
Thawing frozen milk for feeding

Watch Out For

highNew Lansinoh bags frequently leak from seams or develop tiny holes when frozen, leading to loss of breastmilk.

mediumVolume markings on the bags are often inaccurate; it's recommended to measure milk in a bottle before pouring into bags.

mediumBags become brittle when frozen and can puncture easily if dropped or banged against other items in the freezer.

mediumStacking unfrozen bags on top of frozen ones can cause them to stick together and tear.

Community Q&A

How can I prevent Lansinoh bags from leaking during thawing?: Freeze flat, avoid stacking until frozen, thaw in a bowl or ziplock bag to catch leaks, and handle gently to avoid punctures.
Are the new Lansinoh bags worse than the old ones?: Many users say yes, reporting that the new bags are thinner, leak more, and have inaccurate measurements compared to the previous version.
Which brand is the best alternative to Lansinoh?: Medela is frequently mentioned as more leak-resistant, while Target Up&Up and Kiinde are also alternatives, each with their own trade-offs.

Compared To

vs Medela

Some users report fewer leaks with Medela bags, while others find Medela bags stiffer and harder to use; preference is split.

vs Target Up&Up (Up & Up)

Target store brand bags are considered a decent budget alternative by some, but others report leaks with them as well.

vs Kiinde

Kiinde bags are thick and durable but more expensive and don't freeze as flat; some prefer them despite higher cost.

Source Threads

Rant: New Lansinoh bags are the worst due to frequent leaking and loss of milk
The new Lansinoh bags are THE WORST. I opened my new box of Lansinoh bags and the plastic is different and they ALL LEAK. I've lost probably 20 ounces of milk to these crappy new bags. I'm so pissed. The old ones were great. Never had a leak.
r/breastfeedingView thread →
Sad story of losing hundreds of ounces of frozen milk due to new Lansinoh bag leaks
I thought I was going crazy when I kept finding milk in the bottom of my freezer. Turns out the new Lansinoh bags are so thin they develop micro tears when they freeze. I lost over 300 oz of my stash. I'm switching to Medela.
r/ExclusivelyPumpingView thread →
Tips to avoid leaks: freeze flat, don't stack, and thaw in a bowl or ziplock
I had the same issue until I started freezing them flat and not stacking until they were solid. Also, thaw them in a big mug or bowl so even if they leak you don't lose the milk. I still use Lansinoh but I'm more careful now.
r/ExclusivelyPumpingView thread →
Comparison of favorite storage bags: Lansinoh leaks, Medela is better, Target Up&Up hit or miss
I've tried them all. Lansinoh has the worst leaks for me. Medela never leaks but are stiffer. Target brand is cheap but I've had some leaks. I'll probably stick with Medela from now on.
r/ExclusivelyPumpingView thread →
Complaints about inaccurate mL measurements on new Lansinoh bags
The new Lansinoh bags have measurements that are completely off. It says 5 oz but when I pour it into a bottle it's only 4 oz. I now measure in the bottle first, but it's annoying. The old bags were accurate.
r/ExclusivelyPumpingView thread →
Breastmilk storage bag recommendations: mixed reviews, some still prefer Lansinoh over Medela
Honestly I've used both Medela and Lansinoh and I prefer Lansinoh. They freeze flatter and I've never had a leak. Maybe just bad batches? I also like that I can pump directly into them with adapters.
r/breastfeedingView thread →