How to Loosen a Tight Plastic Knot
A tight knot ... Digging your fingers into knotted shoelaces, garbage bags, and other tangles is no fun (not to mention difficult). Reddit...
Jumalkavita shows us a simple trick for opening stubborn knots.
Essentially, you just twist the end of the knot so it constricts, then push it through the rest of the knot. It should slide right through.
More complicated knots may require you to do this a few times, but it should help you get through knots with greater ease than before.