ESINEM EMT shears with a handy LED emergency torch* and karabiner to hang both on your belt or other convenient place. It's all very well having shears but you need to have them to hand and see to use them. It has a light aluminium body so is light but small enough to hold in your mouth leaving both hands free. You'll be surprised how bright it is for its size and find 101 uses.
* Model/colour might vary depending on stock