They could be filled with uncharged pouches by using them on the gem, and could then be be taken to a summoning obelisk. The pouches in the gem would be automatically infused along with the other uncharged pouches in your inventory, and would be removed from the gem, automatically noting some of them if you didn't have enough space. It is able to store up to 20 pouches and has a total of 400 charges. One charge is consumed for each pouch that is created through the gem. Once the 400 charges are consumed, the spirit dragonstone is destroyed. Withdrawing uncharged pouches from the gem does not consume charges.