Download Inventory System FREE Unity. 

The Inventory System & Editor Extension is a complete Inventory, Item and Character Sheet solution providing loads of neatly organized and documented parameters allowing full customization of UI as well as gameplay features with little to no coding.
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The system couldn’t be easier to set up. Simply select the Player, choose how you want it and hit “Set it up!”. The Editor Extension does the rest and the system now works in-game.

Features
– Automatic set up using the editor.
– Fully customizable windows.
– Easy creation of Items (Equipment, Weapons, Consumables etc).
– Works for both first and third-person games.
– Fully documented code.
– Split up into a variety of functions making it easy to program for.