I tried hemp for a couple strings and didn't like it at all-bulky, weak, slow and fluffy. The hemp we can get here is too variable in diameter to make a decent string, you have to build the string oversized to compensate for the weak spots in the threads. If you want a true primitive natural materials string with good performance, go with rawhide or sinew. To my way of thinking, if it comes on a spool from a factory, it ain't "primitive" to begin with, so you might as well use what works the best. Good linen makes a decent string, but it's not nearly as durable as dacron, and it comes on a spool from a factory, too.