Fix pushed to avoid backpacks getting into that state in the first place and also added a note in the tooltip to highlight it's right click to open as that was missing.
To fix any existing broken backpacks, load into a map, drop the backpack on the ground and then loot the tile to pick it back up and it should now work again as intended.
Great to hear you found it quite fun so far, a lot more to come!
Maps will have the same layout and units but their stats and gear in boxes/inventories will reset. Main driver for this was faster load times but it also makes inventory management more important. It also results in higher risk hunts when you're holding a lot of shards which keeps things interesting. I have been thinking about the ability to buy a house in a village that will keep your stored items saved but that needs some more thought
