I've always carried a victorinox swiss army in my pocket - currently the small tinker model.
Not exactly a pocket knife but I've carried a KA-BAR last ditch neck knife for years. Weighs less than an ounce and could be a good thing if, like me, you're too old to either run as fast or fight as well as you used to but don't want to conceal a gun. Thankfully I've never had to resort to it. I am thinking I might retire it one day in favor of a Brous Silent Soldier. Significantly heavier though at 3.2 oz with sheath but it looks beatifully made and facilitates many more grip alternatives than the ka-bar.
