Firelight2
(Firelight2)
10
I carry a Victorinox mini everywhere. Great light. 
- the nail file and scissors are excellent for nail care.
- the scissors and knife work great any time something small needs cutting or opening.
- the flat screwdriver head at the end of the nail file is surprisingly useful. For example, I use it to lever off the button boot retaining rings without damage on my Emisar D4.
The only disadvantage is periodically the scissors spring wears out and breaks. When that happens, bend up the remainder of the spring up for another couple years of use, or get replacement springs, or get a fresh knife.