I shoot most of my reloads within the same month, but keep some for SHTF scenarios (I rotate out stock annually).
I vacuum pack 100 rounds in Food Saver bags and cut out two notches on the bag ends to make it easy to tear open. And if the SHTF, it's easy to issue and carry in pockets of my family/friends/neighbors.
If you need desiccant, toss some uncooked rice in the bag - although in many THR threads, it's been more than proven that unsealed rounds left in the open (rain, snow, etc.) shot fine after several months of exposure.