No matter what kind of diving or spearfishing you do, you need to have a safety sausage.
This little device rolls up very compact and may just save your life or certainly keep you from floating around for a very long time while your boat looks for you.
it has reflective tape on one end as well as a small, very loud whistle attached.
it is 4’ long when inflated but smaller than your hand when stowed.
it even has a clip so you can clip to your gear or even your gun.