Tying knots

  1. Is there ever an issue tying shoes on shabbos in whatever kind of knot keeps the shoes closed and won’t be opened until the shoes need to come off ?
  2. How about tying a simple knot on plastic bags which contain food ?
    3.how about tying a knot on a bag containing something which is going into the garbage and you don’t want the garbage to smell all shabbos so you’re knotting the plastic bag containing the offensive item?
    Thank you !

All excellent questions.

  1. Shoes may be tied on shabbos in whatever kind of knot keeps the shoes closed and won’t be opened until the shoes need to come off

2.Same for plastic bags.

  1. As well as garbage bags, but don’t tie a double knot unless it won’t stay closed without it.