I am making a backpack and have taken to using cord and knots instead of webbing and buckles. But I have had trouble finding a good knot for adjusting the shoulder straps. On my previous backpacks I have used various friction hitches, but they tend to weld themselves in place from the weight of the bag (this is for climbing gear and totally about 50lbs). I have been kind of stuck on the friction hitch idea, but I am open to other suggestions.
So I need something that can be tightened (preferably under tension, something the friction hitches cannot do), and released relatively easily. Preferably all of this being done with one hand (also a problem for the friction hitches) and without looking (much). The bag is just for me, so I don't have to worry about having to train someone else how to use it. It would also be nice if the knot/s were pleasing to look at, but I am more worried about functionality. And I am mostly using 550 paracord.
Maybe I just have to give in and use webbing here, but part of the fun is the design challenge.