Um... you don't, and why would you try to? It's not meant to be concealed. You're talking about hiding something that's, give or take a few inches, a foot shy of a baseball bat. Firstly, a little bit of a reality check, win or lose, fighting hurts, no one's going to respect your authoritah and let you smack them with a stick, avoiding bad situations might not be the picture of manly chest thumping, but it doesn't hurt, in fact, I find it quite nice. Consider other options if you really, really need to carry something. Forgetting that you'll probably never ever need it, if you did find yourself in a bad way, how would you get it out of a bag or, god forbid, your pants leg fast enough to prevent you from getting your ass whooped, which hurts BTW? Second, legal or no, if a cop finds you with that, they're going to want to know what's up, and if you try to hide it, it's going to be pretty obvious that you have it, and they could cause you problems just for the sake of causing you problems. On that note comes the third problem, which is the most important for people that typically ask this kind of question, however you try to conceal it, it's going to look really silly.