I use storage bins with a hole cut in the end. They love it! Especially the scovies, since they are crevice-nesters.I also observed when I had those buckets in the duck house That they preferred to make nests out in the covered part of the run where they could dig a little hole in the ground. The ones who went broody out there seems to hatch more eggs as well. I think the curvature of the bucket made it difficult for them to turn their eggs the way they wanted to.