How to Tie the Cossack Knot
Usage
The Cossack Knot gives you a fixed loop you can tie quickly, load hard, and still untie cleanly. It is catalogued here separately from the Eskimo Bowline: the Cossack Knot is the form carrying the Russian name Казачий узел, it is used in place of the bowline in Russian rope practice, and it is the non-slipped parent of the Kalmyk Loop.
Structurally it is a bowline with one move inverted: the working end enters the nipping loop from the opposite side, and the collar U-turns around the outgoing eye leg instead of around the standing part — the side under load. That change gives the knot its behaviour: it holds a wide-stretched loop well, resists being shaken loose, and opens easily once the load comes off.
Why Learn the Cossack Knot?
The knot has four variants, set by which way the nipping loop twists and whether the tail finishes inside or outside the eye. That tail position is not cosmetic — it changes how the loop behaves under a sideways pull. Working through the tie in the Knot IQ app and practising both tail positions with the Knot IQ Companion Kits is how that check becomes automatic.
Common Uses
Everyday Rope Work
- A quick fixed loop for hauling and bundling.
- Any job calling for a stable loop that unties cleanly afterwards.
Camping and Bushcraft
- Shelter guy-lines that must stay put under wind and vibration.
- Securing gear to stakes or fixed objects, where the loop must resist shaking loose.
- Loops stretched wide rather than pulled with both legs parallel.
Arborist and Load-Pulling Work
- Workable for pulling loads when snugged hard and inspected — but the collar can rotate and jam, so use a locked bowline for any life-support anchor.
Other Names
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Notable Features
- Quick to tie: a single nipping loop and a collar.
- Non-jamming: it unties cleanly after loading.
- Resists shaking loose: it holds under vibration better than a standard bowline.
- Compact: dressed, it settles into the trefoil shape described on the Knots 3D page for the same knot.
Similar Knots
Eskimo Bowline vs. Cossack Knot
Both sit in the anti-bowline branch, with the collar around the outgoing eye leg. The Eskimo Bowline covers the Arctic side of this loop.
- Advantage: the Cossack Knot is the Russian-tradition form used in place of the bowline, and the knot the slipped Kalmyk Loop is built from.
- Disadvantage: the two are close enough to be confused, as are the four variants inside the branch — read the collar and the tail to know what you tied.
Bowline vs. Cossack Knot
Same three components, one inversion: the bowline's collar wraps the standing part, the Cossack Knot's wraps the outgoing eye leg.
- Advantage: it ties fast, unties cleanly, and resists shaking loose and a sideways pull better than the bowline.
- Disadvantage: it is less stable overall, capsizes if not well snugged, and lacks the bowline's recognition and easy inspection.
Sheet Bend vs. Cossack Knot
Their core nubs look near enough identical to be confused with the Sheet Bend.
- Advantage: the Cossack Knot is an eye knot, taking force from three rope parts rather than two.
- Disadvantage: it mimics a sheet bend when the eye is pulled apart, so bend strength figures do not transfer.
Security Level
Treat the Cossack Knot as a utility loop, not a life-safety knot. It is not inherently secure and capsizes under high load unless well snugged, so set it hard and back it up with a stopper for anything beyond attended everyday work. For a fixed loop that has to hold a person, use a secured bowline such as the Bowline with a Yosemite Finish.
Downsides
- Capsizes if loose: loaded before it is snugly dressed, it can collapse.
- Not for slick rope under a sideways pull: the tail-outside form can slip on dry-treated synthetic line.
- Hard to inspect: it looks much like a standard bowline and like its own siblings.
- No quick release: it is a fixed eye — use the slipped Kalmyk Loop to spill the loop fast.
History
On arctic explorer John Ross's first expedition in 1818 the Inuit presented him a sled whose rawhide lashings contained several of these knots; it is now in the Museum of Mankind, London. The name this article uses comes from the Russian side: Lev Skryagin's Морские узлы (Marine Knots) records it as the Cossack knot and its slipped version as the Kalmyk loop, as Wikipedia sets out. The analytical name "anti-bowline" was coined later by Dan Lehman in discussion at the International Guild of Knot Tyers.
How to Tie the Cossack Knot
Step 1
Make an overhand loop — the nipping loop — near the working end.
Step 2
Bring the working end up through the loop.
Step 3
Pass it over and around the bight of the loop and collar it around the outgoing eye leg — the leg heading away to form the eye, not the standing part.
Step 4
Pass the working end back down through the nipping loop, entering from the side opposite a bowline's.
Step 5
Snug the collar around the outgoing eye leg, then draw the standing part to close the nipping loop and set it firmly. Finished, it shows a trefoil shape with the tail against the eye leg.
FAQ
What is the difference between a Cossack Knot and a standard bowline?
Check the collar. A bowline's collar wraps the standing part; the Cossack Knot's collar wraps the outgoing eye leg, and the working end enters the nipping loop from the opposite side.
Does the Cossack Knot jam?
It is non-jamming in normal use and unties cleanly after loading. After very heavy loading it can tighten up, but usually still loosens easily.
How do I untie a Cossack Knot?
Take the load off, break the collar back off the outgoing eye leg, then withdraw the tail through the nipping loop and the knot falls open.
Can I use the Cossack Knot for climbing or rope access?
No. It is not inherently secure, it is hard to inspect against its own siblings, and it has never been rigorously tested — use a secured bowline for any tie-in or life-support anchor.
Important Notes on Safety
- It is not inherently secure and capsizes under high load unless well snugged. Set it firmly before loading and never use it unbacked for a life-critical load.
- Its resistance to a sideways, ring-type pull is contested: the tail-outside variant has slipped at less than a body weight on slick dry-treated rope.
- No rigorous strength data exists for this knot, so keep it to utility work.
