How annoying that small chest in D2 was. How irritating this hassle with mules was for storing and transferring items. Many players had tons of mules: a mule for runes, a mule for gems, a mule for one type of gear, another for a different type. It was a nightmare, in general.
What are these mules (characters-chests?) for storing? Are they only available on Battle.net servers, or are they also available in some versions of the single-player game? :)