Bowline
Part of Knots and Cordage
The bowline is the quintessential non-slip rescue loop. It holds under extreme load, never tightens on whatever it encircles, and unties cleanly after use.
Why the Bowline Is the King of Knots
Sailors have called the bowline the “King of Knots” for over 500 years. The reason is simple: it does one thing perfectly. It creates a fixed loop that will not slip, will not tighten, and will not jam. You can load a bowline with thousands of pounds of force, and when the load is removed, a sharp push on the back of the knot breaks it free.
In a post-collapse scenario, the bowline is your most versatile single knot. It anchors shelter ridgelines to trees. It creates rescue loops to haul people out of water, holes, or rubble. It secures boats, rafts, and improvised harnesses. It ties off loads on pack animals or improvised carts. It creates the fixed end of a clothesline, a snare trigger, or a fishing rig.
Learn this knot until you can tie it asleep, one-handed, behind your back, and in the dark. It will save your life or someone else’s.
Anatomy of the Bowline
Understanding the structure prevents errors:
- Standing part: The long end of the rope leading to the load or anchor
- Working end (tail): The free end you manipulate while tying
- The small loop (“rabbit hole”): Formed in the standing part; the working end passes through it twice
- The large loop: The fixed eye that goes around the object or person
- The collar: Where the working end wraps around the standing part before re-entering the small loop
When correctly tied, the working end exits inside the large loop, running parallel to the near side. The small loop cinches around the collar, locking everything in place through friction.
Standard Two-Handed Method
This is the classic method. Practice it until it takes less than five seconds.
Step 1. Determine the loop size you need. Hold the rope at the point where you want the bottom of the loop to be, with the working end in your dominant hand.
Step 2. Measure enough working end to complete the knot (roughly three times the diameter of your desired loop plus 20 cm for the tail).
Step 3. Form a small overhand loop in the standing part. The working end crosses over the standing part. This orientation matters. Pinch the crossing point with your non-dominant hand.
Step 4. Pass the working end up through the small loop from underneath. Pull it through until the large loop below is the size you want.
Step 5. Route the working end behind the standing part (going away from you, around the standing part, coming back toward you).
Step 6. Pass the working end back down through the small loop. It enters from the top and exits underneath, now lying parallel to the near side of the large loop.
Step 7. Tighten by holding the working end and the adjacent side of the large loop together, then pulling the standing part firmly. The small loop should close snugly around the collar.
The Speed Method (Flying Bowline)
Once you understand the structure, this faster method works well:
Step 1. Hold the standing part in your non-dominant hand, palm up. Lay the rope across your palm.
Step 2. Twist your wrist toward you (clockwise for right-handers, counterclockwise for lefties) to form the small loop. The working end is already through it.
Step 3. Route the working end behind the standing part and back through the loop.
Step 4. Tighten. Total time with practice: under three seconds.
Bowline Variations
Water Bowline (Double Loop Bowline)
Adds a second turn to the small loop, making the knot more resistant to shaking loose when repeatedly loaded and unloaded (such as a boat mooring line bobbing in waves).
Step 1. Form two small loops in the standing part instead of one (essentially an overhand loop with an extra twist).
Step 2. Complete the bowline as normal, passing the working end through both loops.
When to use: Mooring lines, applications with cyclic loading, slippery wet rope.
Bowline on a Bight (Double Loop)
Creates two fixed loops from a single knot, useful when you need a two-point attachment. Can be tied in the middle of a rope without access to either end.
Step 1. Form a bight (fold) in the rope.
Step 2. Tie a bowline using the doubled rope, treating the bight as your working end.
Step 3. After pulling the bight through the small loop, open it wide and pass it back over the entire knot and behind the two standing parts.
Step 4. Slide it down and tighten. You now have two independent loops.
When to use: Improvised rescue harness (one loop under arms, one around thighs), two-point anchor, bosun’s chair.
Running Bowline (Slip Noose)
Thread the standing part through the bowline’s large loop. The result is a sliding noose that grips under load but releases when slack.
When to use: Lassoing, retrieving objects, cinching bundles. Never for rescue — it constricts.
Reliability Under Different Conditions
| Condition | Performance | Notes |
|---|---|---|
| Dry natural fiber rope | Excellent | Ideal combination |
| Wet natural fiber rope | Excellent | Swelling actually increases grip |
| Dry synthetic rope (nylon, poly) | Good | Add a stopper knot to the tail |
| Wet synthetic rope | Fair | Slippery; use a water bowline or stopper |
| Rawhide or sinew | Excellent | Holds very well; hard to untie once dry |
| Improvised plant cordage | Good | Keep tail long; cordage is rough enough to grip |
| Paracord (550) | Good | Always back up with a stopper knot |
| Bungee/elastic cord | Poor | Do not use; elasticity allows capsizing |
Failure Modes and Prevention
The bowline is reliable but not infallible. Know what can go wrong:
Capsizing: If the tail is too short or the knot is not properly dressed, a bowline can “capsize” (transform into a different, weaker knot) under ring-loading (force applied perpendicular to the loop). Prevention: leave at least 15 cm (6 inches) of tail, and always dress the knot carefully.
Shaking loose: An unloaded bowline can work itself loose through vibration or repeated slack-and-load cycles. Prevention: use a water bowline, or tie a stopper knot (overhand) in the tail snugged up against the bowline.
Incorrect tying: The most common error is threading the working end through the small loop in the wrong direction, creating a “cowboy bowline” or left-handed bowline. This version is less stable. Prevention: always verify that the tail exits inside the main loop.
Critical Inspection
Before loading any bowline: (1) the tail runs parallel inside the main loop, (2) the tail is at least 15 cm long, (3) the knot is snug with no loose sections, (4) for synthetic rope, a stopper knot backs up the tail.
Teaching Others
In a group survival situation, you may need to teach the bowline quickly. Use the “rabbit story” method:
- “Make a small loop — that’s the rabbit hole.” (Form the overhand loop.)
- “The rabbit comes out of the hole.” (Working end up through the loop.)
- “The rabbit runs around the tree.” (Working end behind the standing part.)
- “The rabbit goes back into the hole.” (Working end back through the loop.)
- “Pull the tree to tighten.” (Pull standing part.)
This mnemonic works for all ages and skill levels. Have each person tie it 20 times before moving on.
Real-World Applications
Shelter building: Tie a bowline around a tree at chest height to anchor a ridgeline. The loop goes around the tree; the standing part runs to the shelter. The bowline won’t damage the tree bark like a constricting knot, and you can untie it easily when you move camp.
Water rescue: Tie a bowline to create a loop large enough to fit under a person’s arms. Throw the loop to the person in the water. When they put it over their head and under their arms, haul them in. The loop will not tighten and crush their ribs.
Load securing: Bowline at one end, trucker’s hitch at the other. The bowline provides a fixed anchor; the trucker’s hitch provides the tensioning mechanism. This combination secures any load to any platform.
Improvised harness: Two bowlines — one around the waist, one creating leg loops — form a basic climbing or rescue harness. Pad with clothing at pressure points.
Practice Progression
| Level | Drill | Goal Time |
|---|---|---|
| 1 | Tie a bowline, two hands, looking | Under 15 seconds |
| 2 | Tie a bowline, two hands, eyes closed | Under 20 seconds |
| 3 | Tie a bowline around a post without seeing behind it | Under 25 seconds |
| 4 | Tie a bowline one-handed (see One-Handed Tie) | Under 30 seconds |
| 5 | Tie a bowline around your own waist | Under 15 seconds |
| 6 | Teach someone else to tie a bowline | Under 5 minutes |
Key Takeaways
- The bowline creates a fixed, non-constricting loop. It is the first knot you should master and the one you will use most often.
- Always verify the tail exits inside the main loop and is at least 15 cm long. An incorrectly tied bowline can fail catastrophically.
- Back up with a stopper knot on slippery rope. Synthetic and wet cordage can allow the bowline to work loose.
- The water bowline and bowline on a bight extend the bowline’s capabilities to cyclic loading and two-point attachment.
- Teach this knot to everyone in your group. A survival community where everyone knows the bowline is dramatically more capable than one where only one person does.