A guy I knew was doing a lot of hard core bush flying. He carried 2 kits, a full one for the aircraft and small kit of the basics he wore in a vest. with pockets including a pocket for his PLB, that way of the aircraft was lost ( ie burn't out or sunk) he would have something.
Maybe a bit over the top but for many years I kept a little tin survival kit in my flight bag which lived on the floor beside my seat.