First Step:
Create a chest (or DoubleChest)
Second Step:
Create a Sign ABOVE the chest or doublechest with the word: "deathchest" (not case sensitive) in any line.
Third Step: The text on the Chest will be filled automatic.
1 line: your name 2 line: "[DeathChest]" 3 line: the world name 4 line: empty
Just open your DeathChest, and you will find all your transferred Items in it
Fourth Step: Just die.... This can be done any time and it is not necessary. ;) But if you die, your stuff will be stored.