I think all games should do that. It is the most logical way to have multiple characters on one account and not have the danger of loosing items between accounts. Blizzard knows that there is such thing as a mule so I would think that at the least they would add a "Mule" stash that would allow you to store items and trade them over, i don't know, a trade channel. Or give an item to someone via channel so you don't have to be in the same game.

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