Mule
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From Diablo Wiki
A mule is generally a secondary character used by a player in order to store more items than one alone can store in his or hers inventory and stash.
Contents
Diablo II[edit | edit source]
This is a huge part of the Diablo II gameplay, where each character has a very small amount of space to store items. While it might be improved upon in a future patch by Blizzard, it's currently a problem for many players, and a source of some annoyance. A Muliing Guide gives advice on how to use and manage mules.
Diablo III[edit | edit source]
Diablo III will feature a much larger stash with some sort of way to share loot between characters of one player, and will most likely have a lot fewer mules.