In addition to what's already been posted, I'm gonna copy and paste what I posted a few days ago...
If you're going to be in the game for a while, it will benefit you to look into some more permanent storage options.
Ceramic jars that are glazed and have silicone seals will last a long time. Like the promo jars that were being given out a few years back by some of the manufacturers. I have several, but I don't use them because they are rather large and unwieldly, and if I'm setting aside that large a quantity of tobacco I just put it in Mylar and stuff it in my cellar for several years.
Glass bail jars (Fido, Kilner) that were made to keep stuff fresh (not the cheap knock offs) with rubber seals work very well too. The tobacco I keep in my working rotation is stored in glass bail jars, and some of it has been sitting around for several years. Depending on how often I open those jars, at some point the tobacco may become somewhat dry, but that's most likely because of all the air changes due to the frequency of opening. Rubber seals will degrade, but if the jars are kept in a dark, cool, dry location that will keep them from drying and cracking for a hell of a long time. (Years)
The infamous Mason Jar... I don't know what the red goop is around the edge of the lid. I've got Virginias stashed away with 15 years of age on them. They weren't vacuumed, and the rings were tightened after sealing. The lids are domed up from expansion. If the rings weren't tight, the lids probably would have popped off by now. Ball only guarantees the seals on the lids for 18 months, so take it for what it's worth. And I'm not going to melt down paraffin wax to seal over the lids... Incidentally, bee's wax contracts when it cools, so I wouldn't recommend using it.
I would have to say Mylar is probably the most idiot proof long term storage method. However, leaving enough space in the bag for expansion is a must. I've had bags of Virginias that looked like Mylar balloons after several years because I jammed them chock full. There is a possibility that the seals could split open.
Finally, tobacco is a pretty resilient product. Manufacturers have tons of tobacco sitting in warehouses that's not hermetically sealed. If it does dry out somewhat, it's rehydrated by spraying or steaming.
If tobacco sits for decades in a dry atmosphere and the oils in it evaporate, then it's toast. If it dries out a bit after several years, I just add a few drops of water to it, shake it around and set it aside for a few days or weeks. Then it's fine.
