I never haul cans backpacking either but a P-38 is always on my key ring. Those little guys do more than open cans! If you dress up the edge very slightly with a chain saw file or crock stick, they will cut string/tape, open boxes and envelopes. Not razor sharp but a little shaper than how they come. They'll do 80% of what I use a pocket knife for. For car camping they are great to have around.
What a wonderful little tool, Pika!