Carter Hall and PA, will last a very very long time, even if dumped out in the yard. Last Spring, I found a pouch of Carter Hall in my tractor from the previous year, and it smoked great. But, the pouches described in the OP are very different. The foil packets used by Esoterica are designed to be very air tight. That said, I still always jar up my Esoterica products, because I don't wan't to ever open half a pound of anything that has been aged. In my experience with aged blends, they turn to crap very soon after exposed to air. So, I would have to chain smoke an aged pouch of Stonehaven, shortly after opening it. So, screw that. I put them in the small half-pint jars in 2-3oz ratios. That is the amount that I can enjoy, before getting tired of the blend and wanting something else in my rotation. But, the foil was designed for aging, if you want to ever quickly smoke half a pound of an esoterica. I also never buy the 100gram tins for the same reason.