Tarred Nylon Twine is often called "Bank Line" because it is used for making both bank and trot lines. However, because of its strength, it is great as a cordage for all types of survival situations, and because of its size, you can carry a lot in a kit. It can be used to build shelters, traps and snares, and a host of other chores. Being tarred, it doesn't rot, is excellent at holding knots, will not unravel, and is lightweight (which makes it easy to carry). We offer it in two (2) sizes and strengths. The #18 is a great size to include in kits and I have re-wound it on various items for carrying in a kit. The #36 is twice the diameter but twice the strength for those requiring a stronger cordage. #18 Bank Line comes on a roll of 250 feet with an approx. tensile strength of 160 pounds.