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# It is permitted to tie a single knot in two strands of string even if it is tight and meant never to be undone. <Ref>S”A HaRav 317:1, Yalkut Yosef (317:11, [[Shabbat]], vol 2, pg 562), The Shabbos Home (Rabbi Simcha Cohen, vol 1, chap 13, pg 207) </ref>
# It is permitted to tie a single knot and then tuck in the ends of the string so that it doesn’t come out only if it is menat to be undone within 24 hours. <Ref> The Shabbos Home (Rabbi Simcha Cohen, vol 1, chap 13, pg 207-8) </ref>
# One may not add a second knot on top of a preexisting single knot,<ref>Shemirat Shabbat KeHilchata (in the new edition 15:53) , Chazon Ovadia Shabbat Part 5 page 68 also says it's worthwhile to be stringent. </ref> nor may one add a third knot onto a double knot in order to tighten it. <ref>Shemirat Shabbat KeHilchata (in the new edition 15:53), 39 Melachos (Rabbi Ribiat, vol 3, pg 799) . </ref>
== Double knots==
# It is permitted to wrap a string around an object and then tuck the ends of the string in even if it is meant to be left permanently. <Ref> Rama 651:1, The Shabbos Home (Rabbi Simcha Cohen, vol 1, chap 13, pg 208) </ref>
==Twist ties and Cable ties==
# Some authorities forbid using wire twist ties to close bags unless one plans to undo it within 24 hours. <ref>Shemirat Shabbat KeHilchata 14:9 and (15 note 166, in the new edition note 174) quoting Rav Shlomo Zalman </ref> However, others permit. <ref> 39 Melachos (Rabbi Ribiat, Melechat Koshair note 54) quoting Rav Moshe Feinstein </ref> It is praiseworthy to avoid using them if they will remain undone for more than 24 hours. <ref>39 Melachos (Rabbi Ribiat, vol 3, pg 800) </ref>
# Some poskim permit using plastic cables ties since it is not a knot, but simply tightening. <ref> Chazon Ovadia Shabbat Part 5 page 75 </ref>
== Fixing clothing ==

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