Okay, this is a confession and a heresy. I keep the tobacco in its tub, and so far, this has not caused it to degrade. It remains smokable and good. If I had a tub I seldom smoked, I'd jar it, but most tub tobacco remains in rotation. My disclaimer is that central North Carolina is humid, not sultry like our neighbors to the south, but definitely humid. I think this maintains tub tobacco sufficiently well.