I have my Gerber EZ out clipped in a cargo pocket when I go white water rafting and I even swim with it. No rust!. You should consider more than just a knife. A large OC can or a stick maybe viable. I can't imagine you exitng a pool to "knife fight" a guy with a crow bar. I always looked at a knife as a good "carry" weapon but the fact is that if you draw your knife on someone, even if you are being attacked you will be cahrged with a crime. A kid (I forget where) was being bullied by another and was being beaten badly. He stabbed the other kid a few times to get him to back off. The kid that stabbed in SD was sentenced to jail. The other guy even admitted that he did not think that the kid should go to jail but should pay for his medical bills. A knife is a contact weapon. It is not less than leathal. Don't let anyone tell you other wise or they are full of ****. Second of all, if these are high school jerks, self defense with a knife won't look good. I would keep a less than lethal weapon as my first option. A knife is a last resort. If you don't believe me go ask a criminal defense attorney. Good Luck.