Don't know about your tastes/needs/preferences, but if you do not have one, I recommend the "Tinker." I have had one in my pocket for 30+ years and it has gotten near daily use for that time. It has all the basics and is small and light enough to go in a suit pants pocket. Has the following:

Large knife blade,
small knife blade,
Phillips screwdriver,
large screwdriver,
small screwdriver
Bottle opener,
can opener,
wire stripper,
reamer/punch,
tweezers,
toothpick
3 1/2 inches long

Only missing a corkscrew, but I really don't need that in the US; if in France, you may want to add that to the list. . .