When father bought his seed wheat from the seed corn merchant it always came in "one acre sacks" and they weighed 88 kg, (we called it one and three quarter hundred weight) like I said to sow an acre of ground.
Before combines were around, wheat was threshed in the stack yard and wheat going for bread making was weighed off into 75 kg sacks stitched along the top by hand, the buyer most often supplied the hessian sacks.
The sequence for loading a wagon was different, they were brought out of the shed on a sack truck where two men would lift them between them with a short stave of wood under the bottom quarter of each sack.
Another awkward and unwieldy dirty job was unloading dried sugar beet pulp in hessian sacks, the sharp dry crumbs of pulp would go down the neck of ya shirt and after half an hours work and sweat would start to make it very sore. These again were in 64 kg hessian sacks (a hundred weight and a quarter) but being so bulky they stood four foot six high and almost three foot wide, so to carry them they had to be well up onto shoulders and neck just to balance and walk with them.
I Remember the Threshing Machine Mishap