It's become an important part of our EDC (Every Day Carry) over recent years: the whistle. The classic use of the safety whistle is, of course, signaling you're in distress and need help. The shrill sound of a whistle is likely to carry much further than the human voice and require much less energy. Three sharp blasts in succession, followed by a pause of at least one minute, and repeated until a response is received. Remember, the number three is key in distress situations: a distress signal can be three fires or piles of rocks in a triangle, three blasts on a whistle, or three flashes of a light.

Our Whistle Sternum Strap Half features a nearly impossible-to-lose whistle integrated into the male (usually the left) half of the sternum strap buckle used on our Brain Bag, Smart Alec, and Synapse backpacks, as well as all three of our convertible travel bags -- the Tri-Star, the Aeronaut, and the Western Flyer with backpack straps. The Whistle Sternum Strap Half is available as an optional upgrade on all these bags: select one at the time of buying one of those backpacks and you'll receive it along with the standard sternum strap, allowing you to swap or carry a backup strap. The Whistle Sternum Strap replaces just one-half of the standard sternum strap, and is also available here for purchase on its own for anyone with any of the above bags made after 2005 (TOM BIHN packs made before about 2005 will have a 1" wide sternum strap and this new whistle strap won't work with those): simply remove the standard male half of the sternum strap half you've been using all these years and replace it with the Whistle Sternum Strap Half.

Available in Steel Grey if you want your whistle be obvious and easy to see, or Bright Orange if you want it to be really obvious and really easy to see.