For closing a Mochila, you can use a Kumihimo cord. In this video I show you how to make a Kumihimo cord with 16 yarns.
Check this site for Kumihimo patterns
http://friendship-bracelets.net/kumih...
Check me out on Ravelry
https://www.ravelry.com/designers/mar...
Or visit my website
https://www.marionverloop.com