I am furious. I have hundreds of ounces of frozen breastmilk in these bags and as I am beginning to use them, about 50% of the bags have holes in them. When I take them out of the freezer to defrost, milk spills out onto the counter or into the fridge and I have wasted so much milk. I try to allow the milk to thaw slowly, but leaking bags means I often have to quick thaw an additional bag to make sure that I have enough. It makes me sad and so angry. I have an unopened box of 100 that I will likely throw in the trash. I would much rather throw away a defective product and lose money than waste another ounce of precious milk. C'mon Medela, you are better than this!