I was so excited to get these bags as a second-time mom, realizing they were half the price and twice the size of bags I used with our first child. The bags are large, although a little flimsy, with a double lock closure. They stored my milk well, but during the "defrost" stage (which consisted of setting the bags in a bowl on the kitchen counter until thawed enough to put in a bottle), milk would leak out of the bags and into the bowl! There were holes in random spots or milk leaking at the seams. The other day, for example, I realized a hole was in the bottom of the bag, so I flipped the bag upside down. The double-lock closures did not hold and, just like that, 7 ozs. of breastmilk spilled to the floor. I know they say "don't cry over spilled milk" but I wanted to. I have had similar experiences with the more expensive bags as well. There just needs to be a better bag out there! Good luck!!!