Lansinoh have replied to my complaint, i the spirit of balance I am pasting it here. It's a very nice reply actually, to my very emotive end of my tether email!
HI bumperlicious
I am so sorry that you have had such a terrible experience with our Milk Storage Bags. I can only imagine how frustrating and disappointing this must have been for you. This company was founded over 20 years ago by a breastfeeding mother for the sole purpose of supporting breastfeeding and I am so sorry that one of our products has not only failed to make things easier for you but has created quite the opposite. It takes an enormous commitment to breastfeed, even more of a commitment to provide breastmilk in your absence. To know that a product of ours has challenged you even further and pushed you to use formula is a terrible thing for you and for all of us here at Lansinoh.
I would like to try and explain what might be the problem: Our biggest challenge is to make a bag that is strong enough while using a completely safe plastic. There are many types of plastic, most of which would be more pliable and more durable. Unfortunately, this plastic has components in it (called plastisers) that could leach through into the milk. Only when using virgin plastic (which we do) can we be assured that the milk can be stored safely with no possibility of an undesired element being released from the plastic. Virgin plastic is more rigid and when the milk freezes, it places more stress on the plastic. The development of a breastmilk storage bag has been a long and costly project for us, but we are determined to deliver a quality bag made of virgin plastic.
I would like to try and help you salvage any milk you may still have frozen - I can send you down two more boxes of our Milk Storage Bags for you to double bag them, please let me know if this would help and I will get them down to you as soon as possible.
Again, I am so sorry for everything you have been through with our milk storage bags and I do hope you never experience this again with one of our products. I can assure you we are taking this matter up with our supplier.
Kind regards
XXXXXx