Mine lives on my keys, which are on a carabiner on my front left belt loop. For convenience, I keep it twisted all the way so it can be turned on as needed. This does lead to the occasional accidental activation, but it's easy to notice and deactivate quickly.
Anytime I carry the H30 anywhere else (in a pocket, a backpack, wherever), I always untwist just enough to prevent accidental activation, as I know it would be very easy for that to happen.