A twist tie is a metal wire that is encased in a thin strip of paper or plastic and is used to tie the openings of bags, such as garbage bags or bread bags. A twist tie is used by wrapping it around the item to be fastened, then twisting the ends together (thus the name).
Are these allowed to be used on Shabbos? Or is it the same as tying a knot, which is prohibited? Would it matter how many twists are made?