We have added a new plugin to Towny that will serve as more storage while you are on your mining adventures! As shown here: (link)
Open with /storage.
You start out with 5000 blocks that can be stored. At this time you can increase that from the /gemshop "Perks" category as shown here: (link)
As this is brand new, we are open to adding more things to the filter within reason like woodcutting drops, farming drops, etc or blocks you get from mining that we missed. We also are open to feedback on the prices in the Gem Shop for this feature and any other ideas you may have/want.