Victorinox Classic SD - Original Swiss Army Knife
What I love about it is it is so light and small enough at 2 1/4 inch lenght to add in my key ring.
It is the same size as my Sandisk Cruzer usb flash drive. Tools included with the knife are: scissors, toothpick, tweezer, nail file with screw driver tip, and a key ring. The knife retails for $17.50 at Amazon but I got it for $8 when it was on sale.