A small tag could be sewn into the closure once the sack was filled just as it was some years ago. I am afraid that bugs and possible poisons (from the crazies) would be a problem but I surely would like to see it again, at least on a trial basis to determine the cost effectiveness and safety. In the humid south, it could be a mold issue.
Originally Posted by Tartan
You're forgetting about the bar symbols that are needed for scanning. It would not be practical to print those on fabric because they would crack or flake off. I have noticed that you can sometimes buy big bags of rice in fabric bags. They are not very nice though.