Oh my goodness! It's as if you were magic! You pulled the string and it opened!
You could do that...or you could follow my approach:1. After 6 unsuccessful tries at opening it correctly, whip out knife.2. Repeatedly stab feed bag trying to cut it open (a feed bag is multiple layers, you know).3. Watch feed pour all over floor.4. Spend the next hour cleaning up feed from every nook and cranny.But, you know, I like your way better ;)