I have some english blends that are 5 yrs old in pouches and they are fine. Not many high-grade, cellar-worthy tobaccos are sold in this form (in the USA, anyway) these days, but it’s an interesting question. There are a couple of different sorts of gaskets available, and I have noticed that some seem to possess more “rubber smell” than others. A couple of the jars I have have a silicone gasket which has little detectable aroma to it, though I don’t know where these would be available individually. I have a half dozen of these, that have held various blends for more than 6 years, without ill effect. Honestly, I think before putting this blend in the press a pinch of stoved Virginia like Sutliff 507 would have bumped up the flavor and complexity a notch.
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This bold vitalizing fragrance rides atop this distant notation of aged wood, soft tart pungency and docile musty barbequed spice. Breathing in its air the tactile effect is stirring by all accounts, signifying that Bag End’s accommodations should prove to be quite obliging. Overall, I would categorize Bag End as a mild to medium strength light English with a subtle burley influence. The taste is that of natural tobacco with no additional flavorings. A quality English style blend from the Country Squire. Despite the presence of the burley, with its sweet/bright Virginias and delicate Turkish and Latakia flavors, Bag End smokes like a milder, somewhat less sophisticated version of Squadron Leader.
All the old knife-lid tins were sealed at normal atmospheric pressure, not vacuum packed. Still today, quite a few producers continue with the “old school” method of atmospheric sealing. Vacuum sealing is the new fangled method that is done by producers who rely Pipe Tobacco in Bags on assembly line techniques to speed production and reduce costs. Foodsaver type vacuum pumps are quite weak, but they do a very good job of evacuating a great deal of the air from the bags they use [which therefore prevents substantial aging from occuring].
If you live on the edge of the Mojave Desert, you will likely have a problem unless your storage area is humidity-controlled. One thing to keep in mind is that the rubber gaskets used with [wire cage] jars will deteriorate. If opened Pipe Tobacco in Cans after about five years, the re-seal may not be reliable. The current rubber gasket material used for Mason jars seems to be a very durable rubber compound. I have some that are about 20 years of age and they’re still functional.
It may be you will be able to smoke all remaining before the mold gets enough water to wreak havoc. There is a difference between an air tight tin and a vacuum sealed bag with all the air evacuated out. A sealed tin still has a small amount of air left in it. This allows the tobacco to age; the chemical reactions that take place in aging require some air to get going. A plastic bag with all the air removed will not have enough air left for the reactions to start. For bulk tobacco storage mason or Ball [brand] jars with good rubber seals work very well as they are air tight and keep the contents from drying out.
What is more, the immediacy of consumption is aptly supported as the tobacco has been conditioned to an ideal level of moisture. Overall, the medium strength, medium- full-flavor profile bestowed is characterized by a sweet, graceful tang accentuated by complex exotic spice and warm robust nutty wood. Leaning on careful balance and proper proportioning Bag Ends stand as noteworthy sampling of the Scottish genre.