In my pocket always is a victorinox swiss army knife: 2 blades, scissors, can opener, bottle opener/screwdriver, cork screw, metal saw/file, awl.
Hands down it is the most useful thing I own. I've had it since I was about 10 years old.
If I'm out hiking I always have a folding saw and a cheap fixed blade knife (mora craftline allround or bushcraft force) also I sometimes carry my billhook in my rucksack. You never know
To me they are tools. Though I'm sure pc plod would like to prove otherwise.... pathetic country I live in.