pack axe is a pretty open for interpretation term, esp on this forum. Pack axe to someone who knows vs someone who doesn't will result in 2 totally different set of opinions. You don't give any insight as to what you will be doing with it, spending range, or quality measures, so that hurts for a proper recommendation perspective.
Possibilities are endless. Perhaps a Wetterlings Hudson Bay, that doesn't meet the typical American Hudson Bay could work. Or a Council boys axe could possibly work, but would be above the 24" length you mention, if that is an absolute for you. Or a Ebay/flea market find could work, they are all the rage by the "restorers" at this time.
Let us know.