KwikTwist is an industrial size twist tie able to hold (so they claim) up to 50KG.
The interior components consist of a heavy gauge steel alloy wire covered with two millimeters of plastic shielding. The exterior foam is soft and easy for the user to wrap or tie around things. The KwikTwist will also float in water, making it a pretty good match for boating and watercraft applications.
Use is pretty straight forward: Wrap it around any object, make 3 tight twists, and your object is held securely in place.