My last harvest i put about 2 ozs+/- per wide mouth quart jar. 6 ozs fit in 3 1/2 wide mouth quart jars.
I do leave an inch or 2 of space in each jar so buds dont get compacted together.
Widemouth half gallons hold 70 to 110 g or so depending on strain from what I have read. I have absolutely no past experience with weed growing though...