 There's a couple different ways that you can seal the sauerkraut product. The one I like to use is, again, washing the leaves and putting the leaves over the top of the packed shredded cabbage. And then I have a plate that I put over that, and I put a jug of water on top of that and cover it with a dish towel. You also can use a food-grade plastic bag, fill it with water, and put that on top. And that really does a nice job, too.