It's dog hair. All of it. I've been saving it for more than two years.
For perspective, the kid in the photo is ten years old and about five feet tall. And the hair is rolled and compacted. Trust me. It's a lot of hair. If I fluffed it up, it wouldn't fit on the counter.
See, I had this idea that I could do something with all that fur besides vacuuming it up off the floor every day. So I started saving it. After a while, I made myself a little spindle out of Tinker Toys and gave it a shot. (You wouldn't believe how useful these things are.) It didn't work. But it did spark a small yet growing flame that eventually became enough of a fire that I ended up buying a spinning wheel. And while you may think I'm crazy...
...I'm not the only one.