M iassognawrote a review of ACR WW-3 Res-Q Whistle on May 7, 2009
Gotta love this whistle. Although not the loudest I've ever tried, it's orange, small and able to be used on a lanyard /zipper. What more could you ask for? They outta make one glow-in-the-dark. but man this rules. I'm a survivalist and highly recommend this.
There's no reason not to have one.