What size hatchet is best for backpacking?

For backpacking where ounces matter, look at compact 'pack hatchets' in the 14-inch / under-1.5 lb range — the Gerber Pack Hatchet and Fiskars X7 are the two most-cited options in mainstream and community discussions. Anything larger than a 14-inch hatchet gets heavy fast; if you're car-camping and weight doesn't matter, a 19-inch camp axe will do far more useful work.