I carried for a long time (my griptilian) but being still a high school student, its not advisable. I go to a private school, so things a lot more lax, but I still would get a little slap on the wrist if I used it irresponsibly. A good friend of mine somehow got ratted out to the establishment about his UZI folder (not a sheeple friendly knife). On the other hand, he was always very responsible about it, so its kinda a mystery. Anyway, I didn't carry for a long time after he got in trouble, but now I have my Leatherman surge in my backpack all the time, and a SAK on my person. Being of athletic build but not a big guy, I figure that running is probably my best option; my Krav Maga teacher calls it the "Nike Defense". Anyway, I since my Grip broke, I don't have a small folder for EDC, so I need to remedy that soon. I always carry when I go on school camping trips, or when I know I'll being doing community service with the school around town. I also take technical theater (lighting, sound, fabrication) as a class, and our teacher strongly encourages us to have multi-tools. I find that my leatherman can do any task better than a tool created solely for that purpose. Then again, a pair of needle nosed pliers is $5, and my leatherman is $80, but I digress