I use what I call The Butcher's Knot. It was taught to me by the guy that taught me to be a butcher. You can tie it with one hand and the harder you pull it the tighter it gets. We used it to tie roast during the holidays. It is a neat little knot. People have tried to watch me tie it and then copy but even when I try to slow down they still dont get it...lol. After tying it a million+ times it's second nature to me, but others just cant get it...