I do field paleontology on the Channel Islands. A lot of walking is involved, and occasionally we have to basically chop concrete. The tool kit has to be light but right.

I literally pack a sharpened pry bar or two which work very effectively for such tasks, along with a relatively small knife. The combination weighs no more than some of the Godzilla knives often considered necessary for venturing into the great outdoors and is considerably more versatile.