The bags leak. I have only had one or two that seal properly out of an entire box, but when I went to reuse them, they leaked as well. The material is way too thin and they develop pin holes too easily, as I filled them with water to find out why they were leaking. Zwilling REALLY need to develop a bag with a thicker material, like every other product uses. I'm angry now that I wasted all of this money on something that doesn't work, and now I have to go buy something else.