Come on, it's more than just an integer. We're talking integers, variables and Boolean values. Yes, the size for this data is small, you're right there. But you also have to realize that this is happening [b]for each player[/b] since the Vault is also server sided. Considering Destiny's sheer player base, multiply 324 by however many registered users there are, that's a lot of information - whether or not each space has an item in it, it's still bytes of size in the billions. I agree with the servers. Like I said, the Vault is both client and server sided - every time a player opens their Vault, the information within it has to be retrieved from the server and then processed by the client.