That is nice work Pip. We all develop our own style as time goes by. I am not sure but KK probable uses thin leather for the binding. Just keep up the good work.
There are squirt caps that will attach to qt bottles.
http://www.springfieldleather.com/WebPage....tem=116-2240700
Or can get the plastic storage bottles with the caps.
http://www.dickblick.com/zz049/16/