I found a large plastic bucket.Its big enough to support a full size keg and ice.Has cool little rope handles on it that help in hauling it around.
I loaded it up with packcrete and a five foot 4x4. After a lot of use and being left outside,
the bucket dried out cracked and fell off.What remained worked as the packcrete was the same size and shape as the bucket.I thought that a metal bucket would rust so I tried this extra large plastic unit and it worked very well.Even after the plastic itself wore away.
Throw a plastic trash bag over the post itself.The rain can saturate the wood,this makes the post a lot harder than it really needs to be and due to this can cause a few problems that dont do much in the way of enhancing the whole hacking process.