It's sort of a hacky sack for cats, this latest DIY cat toy is. It's very easy to make and it's environmentally friendly, because you recycle old socks or shirts to make it.
Basically, you need a fabric tube. The designer used the sleeve from a thermal shirt but also recommends making it with thin socks. Knot one end and trim as needed. Add a little stuffing and catnip. Knot the other end and trim. Voila! Instant cat toy. It looks like something my cats would enjoy, and next time I clean out my closet, I'm making some!