I usually carry a first aid kit when working outdoors but it may not always be immediately obvious where it is located.
I'm not a fan of carrying too much on my belt and my FAK is just a little larger than I would be comfortable with having there, especially as my external belts when kitted for cold conditions tend to be woven.
More than likely it will be in my bag but thinking about the visibility issue prompted me to make this today.
The tag is leather of course but the cross panel is bright glow in the dark vinyl.
I'll attach it to the FAK with a bright cord (better than this one) and it can hang on the outside of whichever bag the kit is in.
Just follow the cord, or even pull on it, and there should be the kit. Simple enough I think.