[Feature request] Backpack Item or remove 200 item inventory limit

[Guedez]

An item that opens an inventory like cold box, but has infinite item limit and it's weight equals it's content's weight + 1.
Optionally, new items stack first with backpack contents and then to inventory.

Alternatively, I'd request to remove the 200 item limit, but I believe a backpack is much easier to implement.