After two years of not doing anything with Minecraft it's time to upgrade the Personal Storage System. Here's the thing: you'll get version 4.0, 4.1 and 4.2! Each brings something new.

What does it do?
The System uses the scoreboard feature to determine which chest
you chose and not allowing anyone else to open it, and
only giving you the ability to have one chest at a time.
(This allows the system to be easily used on servers,
where "bad guys" are likely to be found)

For more information please consult the video.