You don’t need to untie those knots, just take scissors and cut the string close to the bag, take the tip of one side of the scissor and pull one of the stitches out and pull that, it will come undone.
It is satisfying... I used to drive to Sunnyside Queens to the Indian shop for my rice. It was conveniently located next to a German/Polish deli... 😋👍🎄🌟✌️❤️