I made a batch for my family and I did add the 1 Tablespoon of vinegar as was recommended and they came out perfect… so I then proceeded to make 12 more jars for Christmas gifts. They are amazing! I handed them out yesterday, and I’ve already received five phone calls asking for the specifications to the measurements so more could be made. I compressed everything when measuring and added the flour mixtures in the jar about a ½ cup at a time, and there was plenty of room to spare at the top. Just be sure to watch them in the oven, and check on them... for ours, they were done in aproximately 9-10 minutes. Also, if you are making many jars of this recipe, as I did, I found that about four jars takes up roughly one 5 pound bag of flour (with about 1-1/2 C left over) and roughly one 2 pound bag of brown sugar.