Thank you for the advice, however after about 3 hours of trying to get it to work, I cannot for the life of me get it to work.
What I'm trying to set up is to have a "Battle Bag" storage, an 8 slot storage that you can put items into from the menu. Before battle, I put the main inventory into a TEMP storage, and add the Battle Bag storage to the now empty main inventory. Then, after battle, I move the current inventory back into the Battle Bag storage, and add everything from the TEMP storage back into the inventory.
Swapping the inventories actually works just fine. The issue I'm having is, no matter what I seem to try, I cannot for the life of me get battle drops to go to a specific storage. Changing the $gameStorageSystems.storage(0).addItem(item, 1); line to a different storage ID does indeed put the dropped items in that storage, but ALSO still puts them in the main inventory.
I'm guessing that I'm just overlooking something simple, but if you get the chance, I'd really appreciate if you could take a crack at it.