I used the Lansinoh storage bags exclusively when I pumped for my first child in 2015 and never had any problems with it leaking. Whether is was just holding fresh milk or defrosting milk that was frozen a day or months, they never leaked. When I had my second child last year 2018, I came back to Lansinoh when I started pumping for storage and noticed an immediate difference to how the bags felt (especially since I had some old ones left to compare). The plastic does feel ever slightly thinner which is fine as long as it does the job. Unfortunately, we have noticed constant leaking when defrosting milk on numerous occasions and will not longer purchase these.
Hello Mom. We can definitely understand how frustrating this would be and we’re very sorry the bags leaked! We would greatly appreciate it if you could reach out to our consumer affairs team at 800-292-4794 or firstname.lastname@example.org. We would love to get the lot information from the bags you experienced an issue with and do what we can to help make this right for you. We are constantly testing and improving our bags, and feedback from moms like you really does help improve even further. In just the past year we have made upgrades to our production process to ensure this issue never happens again. We hope to hear back from you and thank you again for this feedback.