See this for more information: en.wikipedia.org/wiki/Nag_Hammadi
Here is another grood article: tulibri.blog.de/2009/02/07/nag-hammadi-historisch-5520243/
(scroll down if you are an english speaker)
This is my much simplified version of the nag hammadi binding. I wanted to try this, because I like the ties at head & tail, the long strip that wraps and I especially love the over flap.
edit: 02-10-2009 for typo