Well I had to jump in this one....I too carry a pocket knife...It is a Schrade lockblade ,measures 4 1/2 in. open and 2 1/2 closed..It has a ring to carry on a key chain but the ring came loose so I took it off my keychain and started carrying it in my pocket....Have had it for 25 years and I never leave home without it....Its become part of me........If I am not wearing pockets its in my purse....I use it at work,fishing, shopping,and at Birthday parties............Great for opening those hard to get out of the box toys....:D