Usually a SAK of some sort, most likely a Red Alox Victorinox Farmer. In addition to a SAK I will carry a small fixed blade around 3" to 4" in blade length. Current favorite is a Mora 510, but I also have a Blind Horse Knives Boat-tail Scandi I like a lot. If it is more than a day trip than I will possibly have my GB Small Forest Axe or Sven Saw.