I got the stuffing at walmart in 16oz bags. I think it was about 3 dollars per bag. I used three for harleys bed which is about 4' by 4'. It's called Mourning Glory Cluster Stuff. It is increadably soft. it is supposed to do great in the washer and dryer, never clump, and be hypo-allergenic. I love it and so does Harley. I'm going to make two more for my other dogs. The beds are so easy to make. I made one for my cats when I built them a cat tree and they loved it.