CRKT Box Key Folding Knife
Very small box cutter although it's not limited to doing just that. The blade is only sharpened on one edge making it more suitable for right handed people although despite being left handed it works okay for me. At some stage I may sharpen both sides. It is sharp out of the box, very small ( I've added a lanyard to it so that I can find it in my pocket! ) and feather light. Detent works well and is quite tactile.