What is the UNIQUE piece of kit you always take hunting

[Big Bad]

A very small magnesium block with glued-on sparking rod and similar size steel sparker, fits in a tiny woven nylon cordura pouch and is attached to my key ring. A unique item I found in a US outdoor store and is far from the only emergency firestarter I carry- for instance I also have a split pea lighter on the same ring- but it requires no fuel and is always with me as a third level backup. I think everyone should have one, but I've only seen the forgotten company's fairly nifty products that one time.

 

[Kinthelt]

My InReach satellite communicator. It gives my wife a great deal of comfort as I insist on hunting alone even though I have multiple health issues. She like the fact she can locate me with a click of a button.

You beat me to it. It also helps with the "I'm going to be late for dinner" when I'm out of cell range.

 

[track]

Slingshot and steel ball bearings for grouse.

 

[MiG25]

I carry two unique items in my pocket when I am hunting.
One is a deer call made by the late cgn member Carverk, aka Laurence Knowles of the Eagle Clan, Haida Gwaii.
The other is one of those old style cylindrical metal tube containers for survival matches. I have had it since I was in boy scouts as a kid in the 70's. It is about 1/2 filled with soil from the ground when I harvested my first deer many years ago.
These two items I kinda cherish like talismans and I like to believe they carry both the spirit of my deceased friend and of the deer I first harvested. Maybe strange to think of it that way but they bring me luck so I never leave on a hunt without them in my pocket.

I'm sorry to hear that about Carverk.