Forgive me if this thread is redundant. I've searched the forums and come up empty handed.

I am curious what is the one item that you hike with, regardless of the weight, need, and what every other hiker talking head says...

I carry my handheld thermal imager/camera. It weighs a little over 12 oz with batteries, but man it takes some cool pics! Its neat stay up after hiker midnight and watch the woods come to life with the wildlife when it is pitch black... I think most would be surprised at how much wildlife wander into our camps after we a safely zipped up in our 1 pound tents...:-)
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Whats your must have item, that is not related at all to your hike?