The sacks hold walnuts
and make great landscape fabric.
They make a great recycling bag for the recycling.
They can be unraveled from their current shape as a sack and be sewn by machine to make a large tarp or wind break. I have seen people cut them into strips and crochet them as rugs. They also make fair insulation in an out building...the insides are white.
Not nearly as wonderful as the cloth sacks much of my childhood clothing and quilts were made with but they still have some interesting purposes.
Waste not, want not.