A twist tie has a thin metal wire encased in a strip of plastic or paper used to securely close the openings of a bag such as trash bags, cellophane or bread bags. They are available individually in pre-cut 4", 5" 6" & 8" lengths, or on large spools.

The plastic or poly twist ties withstand water better than the uncoated paper versions. Water-resistant twist ties are sometimes used to package ice, vegetables and other produce. Different sizes and strengths are used for different applications.