Yesterday I learnt a new knot! I came across a rather informative article on the Kryston website which includes the “non-slip knot”.
The non-slip knot resembles some of the honda knots in that it is made from an overhand knot in the standing part. If you tie the overhand by passing a bight through a loop the knot will be half-tied already. Wrap the running end around the main part and feed the end back through the overhand knot. This knot forms a very strong fixed size loop.
The article was about fishing line but the knot also seems to be suitable for larger cordage. It is easy to learn, easy to tie, easy to adjust and relatively easy to untie. The knot itself looks compact and neat. This is a knot that is worth adding to your repertoire.