I made a rag quilt with flannel on the back and denim on the front. I used an extra layer of flannel as the batting layer. Most of the material was recycled and soft from many washings. It is queen size, and I think it must weigh more than 30 pounds. I had to take it to a commercial over-sized washing machine (recommended for the first washing, at least, of any rag quilt). My daughter lives where it gets cold, and she's happy with it. I'm pretty sure it would be warm enough without the extra layer of flannel, and since both flannel and denim are rather thick, probably the quilting would show up well enough without a batting layer of any kind. If you use a rag process with denim, let me suggest that the special quilt snips are not a luxury but a necessity. Also, prepare for more lint and dust than you could possibly imagine. In fact, if I had it to do over, I'd sit on the back porch in nice weather to do the snipping, and not bring it into the house again until it's washed.