Pic attached. It's quite big (foot for scale) and reasonably solid. It came with my coffee beans as packing (instead of those foam packing peanuts or crumpled brown paper). I could just throw it away, but it seems a bit of a waste, plus it's quite heavy and we pay by weight for our refuse collection.
I've never had a time when I thought "I wish I had a burlap sack now", but at the same time it seems like it ought to be useful somehow.