S.T.A.S.H. also known as "Starktech Armory and Supply Hoard"
The S.T.A.S.H. are found in all safe zones found within the game, that functions as the player's very own storage system which are shared by all the player's heroes.
The S.T.A.S.H. has three different sections for all of your loot. General items can be stored in your general Stash section, Hero specific items can be stored in the section associated with your hero, and crafting items can be stored in the crafting section.
It may be expanded by buying extra spaces for 500g.