EASILY open food sacks by “pulling the string”

These feed sacks, rice sacks or potato sacks can be so frustrating to open, you pull the string and nothing happens. You’ve got to do something with the string first before it will pull out magically. If you just cut it with a pair scissors this typically doesn’t work because you have to pull the string through a loop and then everything is free. it does take some practice but once you get it it’s so satisfying watching the string just zip right off