Familiarity with commercial pipe blends means that you are accustomed to tobacco that feels eternally soft. A sealed Mason jar will maintain whatever humidity it starts with. I would suggest storing a pipe blend that seems dry, but does not crumble when crushed. Once sealed, store it in a stable temperature environment, to avoid condensation.
I never worry about storing a blend, since I make up a 1-2 ounce batch, often have 3 or more current batches of different blends, and keep them in quart freezer Ziploc bags at my desk. I smoke them until they are gone. No prolonged storage. That allows me to experiment with new blends weekly.
This thread describes scores of pipe blends that you can make, and that use zero casings.
While some varieties of tobacco can be enjoyable when smoked straight in a pipe, the flavor horizon can be broadened by simple blending of contrasting varieties and cure-methods. My goal in this thread is to present some pipe blends that do not use casing of any kind. [Practically all...
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With Virginia tobaccos, I usually prefer to balance the pH to eliminate tongue bite. The most effective ingredient for that is Perique (excellent, St. James Parish Perique is available at WLT). A pure Virginia/Perique blend seems to pH balance at about 5 parts Virginia to 3 parts Perique. Another approach to balancing Virginia is to use Maryland or Burley or Dark Air-Cured instead of Perique, though the ratios differ for each variety. For your Maryland, start with the 5:3 ratio, and adjust it from there.
Do read about making your own Cavendish, since it is quite easy to do, and adds wonderful notes to your blending experiments.
Bob