A whistle are not unnecessary part of equipment, but do You think it could be useful in urban area?
In a forest or outside of city, where synthetic sounds are hard to find, a whistle can really help You to survive - You just can not cry so loud as professional whistles can. It can be a batteryless signaling "radio" for You also.
But in urban. Hmmm... Really there are overconcentrated sounds cacophony, not so many man can attract sound of whistle. Why the hell You will need to use it at least? Alarm when attacking by criminals? Hah... If You are in a place and a time when You can be attacked - much more useful than whistle can be a pro defence things. A whistle is... Just USELESS.
(sorry for truth, I know so many of You just always having a whistle on).
The only place is a traveling backpack, and as we say before plastic would be just better. Heavy steel whistle in backpack? :)
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