Trying to put together a little wallet survival kit: just essentials for a few days survival if I needed to, things like fishing line and hooks, firesteel/lighter, water purification tablets, and some other bits an pieces, but was trying to find a knife of no more overall length than a credit card which is 3.375 inches approx. So far Ive only found one that size which is the Tops Thumb Nail, but its not got much blade at all. Im sayin' fixed blade but if its just too small for a fixed blade knife all I can do is reconsider and go for folding.