...and store all items in inventar to it. The chest should be lootable but not movable. If player logs in again, the chest is destroyed and the items are placed back in his inventar.
This would have the following effects:
1.) It wouldn`t been possible to secure valuable items by creating an alt-char and putting it in his inventar.
2.) There wouldn`t been the problem that your position is occupied if you login.
3.) Players would logout on proper places, like their claim, their house, etc...