For a camping axe, I'd second the above and look at the 3/4 axes, often called a "Hudson Bay" or "Boy's Axe". They follow the Mors Kochanski recommendation of an axe fitting snugly under the armpit when held by the bit and the butt end of the handle in the armpit. This has been the best compromise size of axe for several hundred years.
IMOP a 20" or so axe is really a big hatchet. Good for if you are going to do a long hike to a campsite. But if you want to do work quickly with relative ease, look at the 3/4 axes.
I guess Fiskars makes one, Estwing makes a 26" camper's axe, Snow& Neally has a 24" Hudson Bay axe, I think the Gransfors Scandinavian Forest axe is that size, and there's always the cheapie hardware store axes in that size. Plenty to choose from.