Nice! I've been experimenting with ear plugs but this idea might even be better! Wonder how long a biodegradable straw would last before it became too degraded in the water you're fishing in?
I was thinking of one like that with a soda straw and a loop of copper wire at one end, then came looking to see if anybody had already done it. Rubber band is a cool idea. Could use uv cement if you don't have a glue gun in your fly tying kit.
Well done but more plastic in the ecosystem would not be allowed in many of our pristine rivers down-under in NZ. A biodegradable straw would solve that! Regards.