I'm pretty sure that we collectively as pipe smokers have developed an irrational fear of things going stale. But, maybe conditions in some people's environment, such as the desert regions, do have a legitimate concern. Lately, I have been pushing the limits, letting whole tins dry out, just keeping my tobaccos in tobacco jars that don't have seals, etc...I have found tins that I thought were empty or lost randomly well over a year later. They have tasted just fine, if not better in some cases.
Guys used to just put their tobaccos in these humidors that had lids that just rested on the lips of the jars. And, guys were all that concerned.
Look at the market we've created with our fears. People fighting over those bakkyflaps and those jar lid pocket thingys. Guys toting jars around in cases to be able to access their rotations on the go. I am becoming more certain that all of this is overkill.
All summer I have just kept a pound of Havana Daydream in the large plastic bag it came in, and I am certain that in the five months that I've been dipping into it, that it has done nothing but gotten better. I don't even seal the bags. I just give it a fold over and go.