I use the 8" silicone loaf mold from Crafter's Choice (WholeSuppliesPlus) or the silicone loaf mold from Brambleberry. Mine are the 8" molds, but they phased those out and came back with a 10" silicone loaf mold. They do bow out in the middle after a bit of use, but i'm going to build a frame to sit them in to prevent bowing. I have wooden molds, but almost always use the silicone loaf molds. The one from WSP holds about 44oz (of soap batter).