The molded whistle and attachment clip of the whistle sternum strap in Orange, made of HDPE. The molded whistle and attachment clip of the whistle sternum strap in Steel (grey), made of HDPE. A whistle sternum strap half in Orange HDPE. A whistle sternum strap half in Steel (grey) HDPE. A whistle sternum strap half in Orange HDPE attached to a Synapse 19.. A whistle sternum strap half in Steel (grey) HDPE attached to a Synapse 19. A whistle sternum strap half in Orange HDPE clipped around a person's sternum. A whistle sternum strap half in Steel (grey) HDPE clipped around a person's sternum.
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Color: Orange

Attach a safety whistle to your backpack straps.

We've retired the Whistle Sternum Strap Half so we can focus our efforts on other projects. You can sign up for our newsletter at the bottom of the page to receive updates on what we're working on next!


You won’t forget to take this whistle on your next hike or trip.

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: three sharp blasts in succession, followed by a pause of at least one minute, and repeated until a response is received. The shrill sound of a whistle is likely to carry much farther than the human voice and require much less energy. 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. Worldwide travel expert Jodi Ettenberg has a great post on safety whistles. You might be surprised to read about the situations in which her whistle came in handy — read all about it here (her whistle is different than ours, but you get the idea).

Have a dog (or two or four) that hike with you? Train them to come to the sound of your whistle. It'll likely take repeated practice, patience, and lots of high value treats to train your dog to come to the sound of a whistle, but it can be very useful in situations when your dogs are off leash and you need them to return immediately. (If you're whistling for your dog, or just testing out your new whistle, try one sharp blast or two, and make sure to give enough time between blasts so that no one thinks you're really in trouble.)

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 BagSynapse 19Synapse 25LuminaryHero's Journey and Guide's Pack backpacks, as well as our convertible travel bags — the Tri-Star, the Aeronaut 45Aeronaut 30 and the Western Flyer. The Whistle Sternum Strap Half is available as an optional upgrade on all these bags: select one at the time you buy one of those backpacks and you'll receive it along with the standard sternum strap, allowing you to swap or carry a strap. The Whistle Sternum Strap Half replaces just one-half of the standard sternum strap and is also available on this page for purchase on its own for anyone with any of the above bags — but note that the Strap Half won't work on TOM BIHN packs made before about 2005 — those have a 1" wide sternum strap and this new whistle strap won't work with that. To install the Whistle Sternum Strap Half: 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 to be obvious and easy to see, or Bright Orange if you want it to be really obvious and really easy to see.


Nylon webbing
Tough Duraflex®, Nexus, and Woojin buckles and related components


.75" / 20 mm width
Rated 4.7 out of 5 stars
Based on 23 reviews
87%would recommend this product
23 reviews
  • Rated 5 out of 5 stars
    9 months ago
    5 Stars


  • Rated 5 out of 5 stars
    11 months ago
    As described

    A clever and cheap way to add a whistle to your backpack for safety.

    James C.
    Verified Buyer
  • Rated 1 out of 5 stars
    11 months ago
    Does not work

    Material wise it's good, but its main function as a whistle does not satisfy me. I can't get a tone out of this thing. It is definitively no quality item. Honestly I expected more from Tom Bihn. Returning would be a big hassle since I'm outside the US.

    Dominik S.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Puts the fun in functional

    Great product

    Nicholas K.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    exactly what it says

    no complaints, i like the orange highlight.

    Connor S.
    Verified Buyer
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Sewn in Seattle

Our bags are designed and sewn right here in Seattle, Washington, U.S.A.

That allows us to be control freaks in the best way possible; we have direct control and oversight of the quality of our materials, our products, and the jobs and working environment that we help create. It also offers us a unique spontaneity: when we have an idea for a new product or accessory, we can design it, figure out how to build it, add it to our website and be ready to ship it out our front door all within just a few weeks. How cool is that?

Intrigued? You can find out more about the unusual way we do business on our Company Philosophy page.

THE BIHN Guarantee

Everything you buy from us here at TOM BIHN is satisfaction guaranteed. We’ve been in business since 1972 and we stand behind what we make.

If something goes wrong and it's our fault, we'll fix it for free. Repairs due to normal wear and tear or due to other things that are not our fault will be performed, when possible, at a reasonable charge right here in our Seattle factory where your bag was made. Defects in materials or workmanship are uncommon and almost always evident while the product is still new. Keep in mind that bags and packs are often subject to extreme wear in everyday use: do not expect them to last forever. Only true love lasts forever! You can expect a TOM BIHN product to give years and years of hard service.