You sound like you come from the cigar side. Once it is in the jar you should not have to worry about moisture level, it is in a sealed jar. I just label my jars, put them in a drawer or box and come back to them about once a year to check that the lid is tight. Pipe tobacco is easy to maintain. Any opened tins get transferred to a jar, occasionally check that tins have not lost seal. 2oz.(weight) tobacco = 8oz. (volume) jar. That is all I can think of on the subject right now.