The Figure-8 On-A-Bight, is used in Canyoneering primarily for creating a “load carrying” loop. It is a safe knot to rappel on, to tie yourself into an anchor point, and to lower or raise people and gear.
To tie, simply make a bight on the rope followed by tying a Figure 8 knot.
Pros:
Creates a secure loop for clipping into anchors or harnesses.
Holds strong under load and is easy to untie afterward.
Cons:
Bulky, which can be a challenge in systems requiring compact knots.
Caution:
Always inspect for proper dressing to avoid weakening the knot.
Canyoneering Usage Examples:
Creating a secure loop for connecting a rope to a carabiner when setting up a belay anchor or rappel system.
Attaching personal safety tethers to anchors during canyon traverses or while waiting at rappel stations.
Additional Reading:
CanyoneeringUSA.com: “Figure Eight on a Bight & Variations”