various examples of double knots and single knots at the end of a bag.
Various important examples which come up on Shabbos in conjunction with the halachas of perfuming or putting in a nice smell into an item;
Planting or Walking with Wet Peios/Raincoats over Grass; How to Handle Very Wet Grassy Ground;
removing wrapping around candies, lollipops, chocolates, etc.